宽容从来不是单向的索取，而是双向的修行。一次两次，人家付之一笑，三次四次，是可忍孰不可忍？宽容是有限度的，忍耐是有底线的，再宽厚的胸怀，也经不起反复消耗；终有一天，这份宽容会消失殆尽，留下的只有疏远与冷漠，更可能是人家的反戈一击。
And though most scientists hail vaccines as one of public health’s greatest achievements, they have provoked fear, distrust, and contentious resistance since Edward Jenner invented the first vaccine, to prevent smallpox, in the late 1700s.
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