无尾猿的脊柱的下端是直的，不是弯曲的。

The lower end of the ape's backbone is straight, not curved.

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在动物学中，人类与猿猴和无尾猿被划为一类。

Zoologically speaking, human beings belong firmly among the -monkeys and apes.

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无尾猿学东西很快，甚至可以教它们使用简单的工具。

Apes are quick to learn, and they can even be taught to use simple tools.

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