我们预防了天花,是因为种牛痘;预防肺结核可以种卡介苗;预防小儿麻痹症(就是脊髓灰质炎),可以吃糖丸,这个糖丸不是巧克力做的,它实际上是一种疫苗,因为要给小孩子吃,所以在外面包上了一层糖衣。那么,要预防癌症有没有什么防癌的针可以打一打,或者有什么糖丸可以吃一吃就不得癌症了呢?若是有,自费也行,贵点也无妨,花点儿钱总比生癌好。可惜没有,不但现在没有,看来今后也不一定会有。为什么?因为传染病往往病因单一,天花是病毒引起的,肺结核是结核菌造成的,只要种牛痘,打卡介苗,提高 We have prevented smallpox because of vaccinia; TB can be prevented by preventing tuberculosis; sugar pills can be eaten by preventing poliomyelitis (this is a kind of vaccine because it is actually not a chocolate). For children to eat, so a layer of icing on the bread. So, if you want to prevent cancer, if there is any anti-cancer drug, you can give it a dozen, or if there are any sugar pills you can eat and eat, you can’t have cancer? If so, you can do it at your own expense. Your point is no harm. Spend a little money. Good cancer. Unfortunately, no, not only is it not now, it does not appear that it will happen in the future. Why? Because infectious disease is often a single cause, smallpox is caused by the virus, tuberculosis is caused by TB, as long as the species of vaccinia, beat the cardinal bacillus, improve