Words are wise men's counters, they do but reckon by them; but they are the money of fools.
免疫系统就像一把双刃剑;它可以对抗癌症,但也需要被控制。
过去从未死去。它甚至还没有过去。
对抗传染病的斗争是一项超越国界的全球性努力。