这张照片里，位于新加坡动物园才两周大的环尾狐猴紧紧的贴在它妈妈的身上。

In this photo, a two-week-old ring-tailed lemur clings on to its mother at the Singapore Zoo.

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在said, asked等词后面用逗号，只有当它们位于句尾时，才在它们的后面用句号。

C Words like 'said 'and 'asked' are followed by a comma. We put a full stop after them only when they come at the end of a sentence.

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对直机翼无尾飞机，只有负弯度才满足飞行条件。

For straight - winged tailless airplanes, only the negative camber satisfies the conditions for flight.

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