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In China, the high incidence of esophageal cancer is concentrated in Lin Zhou district that is located in Henan, Hebei and Shanxi provinces borders (the Taihang Mountains region). With the radius of the distance increases, the incidence of esophageal cancer showed a decreasing trend. High incidence of esophageal cancer rate is very high too in the district of Fei Men. Years of epidemiological survey found that esophageal cancer, cardiac, oral cancer may be related with eating very hot food or drinking hot drinks, we can also say that some epithelial cancers was resulted from very hot foods and drinks.

Other examples also support this view. In Xinjiang province where the Kazakhs nation lives, people like to drink hot milk tea many times each day. In the Chaoxian area in southeast coast of China, people like to have congou tea while the tea is very hot. The descendants of the people who have transmigrated from Fujian province to Singapore also have the habit of drinking hot drinks. The incidence of esophageal cancer in those areas is all higher than in the area of Guangdong province where the people don’t drink hot drinks. These areas are well known for their high incidence of esophageal cancer. This is just the result from the epidemiological survey. As for the specific reasons, we may not be able to tell now.

Through experiment, researchers in United States University of Texas Southwestern Medical Center have found that a material called hunger hormone make the mice find food to eat under the case of not hungry. Researchers built two houses for mice, one is striped walls which placed delicious high-calorie food inside the cabin, the other is gray walls which placed small low-calorie foods. After repeated training, mice have remembered where the house for what it was. Then, the researchers feed the mice so that they choose a hut to enter. The results showed that mice injected the “hunger hormone” are more likely to enter the striped walls cabin, even if there is no food in the cabin. But mice which were not injected the “hunger hormone” showed no preference. Jeffrey Zigman, vice Professor of this experiment, said:” Our research showed that this hormone may affect associated with the consumption-related behavior, which led to over-eating.” The words were quoted by Fun Science Site.

Zigman considered that the “hunger hormone” may produce the extra desire for food.” Mice’s behavior has nothing to eat food, just to get more pleasure.” he explained. Mario Peirello, another charger of this study, said:”We believe that the hunger hormone would make mice go looking for high-calorie foods, because they remember how delicious it is. Even if there is no food inside, it does not matter, mice still believe it can cause some kind of pleasure associated with the existence of things.” there are commons in brain cells connected, hormone type and brain “pleasure center” between human and mouse.

However, the “hunger hormone” is not the only reason for non-stop eating. Other factors may also cause people to over-eating. For example, the firs factor is gene. A gene called GAD2 was found by Imperial College London researchers in 2003, which easily lead to obesity. These genes will accelerate a neurotransmitter synthesis in the brain so as to stimulate people to eat. The next factor is the level of dopamine, a study published on Behavioral Neuroscience magazine in 2007 point that people with low levels of dopamine were more likely to seek pleasure and eat too much. Finally, the third reason is psychological factor. A common phenomenon is that a lot of frustrated people would eat large numbers of food.

We all believe that police officers and fire fighters are dangerous occupations. Yes it is dangerous explicitly. But you can’t imagine that farmers and workers on pasture are experiencing more danger than them, which is easily concluded form the latest statistics from the Department of Labor of America. And the occupational injury mortality of famers is higher than that of police and fire fighters. It is amazing.

Jim Rice, economist of Department of Labor, said that these statistics may be unreasonable. You often hear of incidents of violence, but you seldom read the news that somebody is killed by a tractor. In fact farmers and workers on pasture are more dangerous. Fishers and related workers are more dangerous than pilots and air crew, which is very easy to find.

Some other occupations have higher incidence of injury which need medical treat and vocation. For example the assistants of psychiatrist of the state have higher incidence of injury than police in the same state. And the incidence of jury is surprisingly high among the flight attendants, housekeeping workers and bus drivers. Especially for bus drivers they have to bear the shock and tremble of the bus.

And some hospital nurses also have higher instances of injury. They often prick themselves by the needle. And when they support the patients with hand or move the patients they often get hurt too.

First we should start from operating system if we protect our computers, only our systems are health, they can do a good job on protecting. The operating system’s security protection mainly contains four aspects:
1)    Choose a stable operating system.
One of most popular operating system is Windows, we can select one among the different types, such as Windows XP.
2)    Patch system regularly.
After we install operating system, we should fix patching program to stem software flaw and prevent other exploit software loophole to attack our computers.
3)    The operating system, such as Windows XP, also has some shortcomings, particular the sharing resources under system default give the virus attacking opportunities. Hence, we should turn off the system default sharing resources after we install patching.
4)    Backup the operating system in time.
This step aims to guarantee the security of computer and the data within. Once system is destroyed, we can renew them quickly with backup. 
Second, as we all know, virus can bring many disadvantages to our computers. In order to save more repair bills, I advise computer users had better install anti-virus software. We can buy this software from the market or gain some free anti-virus software. But we should know that we must consider the quality of anti-virus when we select from those different types.
We should disinfect virus with the anti-virus software before we open or operate some documents and care for the procedure on the internet.
Third, install Network Firewall in computers to prevent attacking from other network.
Forth, install Trojan Detection System, though we have already install Network Firewall before.
Sixth, install a eradicate spyware which can record users’ information.
Then we talk some things which we should take care at usual. The hard disk is sensitive to vibration, so we can’t make big vibration when move it. The CPU fears high temperature and high-voltage. Though there is a small fan to protect CPU, with the increasing consumption of current, the heat also increases, so that CPU’s temperature will be rose. It will lead to computer crashes frequently and shorten the CPU’s life; high –voltage is more dangerous and it is easy to burn your CPU. Therefore, add a fan around computer and keep it clean, and had better not open the computer when raining and thundering outside, and match a voltage stabilizer.
At last, whether the outside of the inside of the computer, we should keep them clean, like CD-ROM, Mouse, Keyboard and so forth.
It is bad for our health when we sit long time in front of computer, so every computer users also should take care of our health.

“3G” a new expression has already invaded into our daily life. It embodies a huge progress of technology and change a lot of our life. But do you know what on earth 3G is? Next let us have a discussion on it.
3G is the abbreviation for English 3rdGeneration that third-generation mobile communication technologies. Compared with the first-generation analog mobile phone (1G) and second-generation GSM, TDMA digital mobile phone (2G), third-generation mobile phone generally is the fusing of wireless communications and multimedia communications. There are many differences compared with the pre-phone. The service including like handle images, music, video streaming and other forms of media, including web browsing, conference calls, e-commerce and other information services.
The function of 3G can take you some benefits, and now let’s talk about it.
First, higher-quality calls. You also can choose call with video, when the call can see each other’s movement. It can take you a different feeling compared other video tools.
Second, the Internet more quickly, when you are browsing website than before. But one thing you should remember that if you want to browse a few hours, I think 3G mobile phones may be used is not appropriate, short-term visit is very convenient for you.
Third, the mobile Bluetooth functionality, which can pass photos, music and other material you want from another phone in a very short time.
Forth, the function of TV, this software will become the mainstream in the future. Wherever you go, you can take it out to find the program you want, It really like your TV which is in your home.
Fifth, the mobile download functionality. Via the phone you can download music or novel and so on, but you should install music software. So from this way, you can collect many good sounds.
Sixth, the mobile trading functionality. The specialist forecast that it will be a high increase speed on shopping with 3G mobile phone in the future market of China.
Seventh, the mobile phone positioning system. No matter where you go, to pass through the cell phone and e-map combined how to find nearby hospitals, restaurants, etc
3G is a huge development technology. If we can make full use of it, I think it will change a lot in our life. So let us enjoy it.