我们在少年时代便会滋生一种奇怪的观念：一种肉眼看不见的叫做细菌的小妖怪在不断向我们进攻，我们必须常备不懈地保护自己不受其伤害。

• Early in life, too, we become seized with the bizarre idea that we are constantly assaulted by invisible monsters called germs, and that we have to be on constant alert to protect ourselves against their fury.