10、 No one is glad to hear that his body has to be cut open by a surgeon(外科医生) and part of it taken out
Today, however, we needn't worry about feeling of pain during the operation
The sick person falls into a kind of sleep, and when he awakes, the operation is finished
But these happy conditions are fairly new
It is not many years since a man who had to have an operation felt all his pain
Long ago, operation had usually to be done while the sick man could feel everything
The sick man had to be held down on a table by force while the doctors did their best for him
He could feel all the pain if his leg or arm was being cut off, and his fearful cries filled the room and the hearts of those who watched
Soon after 1770, Joseph Priestley discovered a gas which is now called "laughin