从希腊时代到第一次世界大战，它的工作很简单：与致命疾病和严重残疾作斗争，确保生育以及减少病痛。

From the Greeks to the Great War, its job was simple: to struggle with lethal diseases and gross disabilities, to ensure live births, and to manage pain.

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轰动的原因很简单：首先，美国和中国是世界上最大的两个经济体。

The reasons are simple: first, the US and China are two of the world's biggest economies.

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这些手不会说话，当孩子们的世界很简单时会喜欢它。

These hands don't speak much - they throw about single worlds when they feel like it.

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If you stop and think of it as a grammatical question, you say to yourself, "Gee, that's a very good question, isn't it, because, of course, the easiest thing in the world is to tell the dancer from the dance.

如果你停下来，把它当成一个语法型问句，你对自己说，“哈，那是个很好的问题，不是吗“,因为，当然，世界上最简单的事,就是将舞者和舞蹈分开。

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