哪位朋友能帮我修改下，字数在200字左右3内容 Describe the value of anesthetic? Anesthetic The value of anesthetics to mankind cannot be overestimated. Anesthetics can relieve many pain, it have been of direct value in the saving of lives when operations become necessary. But anesthetics have many serious side-effects. This great boon to mankind anesthetics has been used for only a hundred years. Anesthetics belong to a type of medicines or drugs known as sedatives. A sedative is a chemical substance which tends to dull the senses. They have the chemical property of combining with the nerve tissue, thus destroying temporarily its ability to receive stimuli, When one is under the influence off an anesthetic, one’s body is, therefore, temporarily insensitive to pain, that is , the body does not have feeling , and no messages are transmitted to the brain by the nerves. The anesthetic action or sedative action of an anesthetic is exerted fast.No one can even guess the misery and suffering which men have been spared by the discovery and use of anesthetics. The pain of operations has been relegated to the past. Many lives have been saved and torture has been eliminated from surgery by the use of anesthetics.4 内容If the flu is a disaster, someone thinks it’s only a little nuisance, what do you think about it? Give you reasonsThe Flu: Sure Nuisance, Possible Disaster I think flu is a disaster. At its most extreme, influenza has shown itself capable of producing a disaster to rival the ravages of plague. The flu virus, It was especially good at attacking and killing healthy young men and women.. In 1918 and 1919 it killed about 20 million people. Food distribution broke down in places, and city dwellers went about their business wearing masks, It was an episode that is largely forgotten, because it was too intolerable to remember. The virus is highly infectious, with a built-in mechanism for producing symptoms-coughs and sneezes-that help to spread it, to the extent of causing much discomfort and killing thousands of people, chiefly the old and infirm. Now that cholera, smallpox, and plague are coming under control, influenza will soon be the only pandemic disease left. And on the admittedly slender evidence of recent decades, the next major transformation is not far off. So if we pay no attention, we will fall in danger.