旧石器时代的人类只能制造最简单的石器。

Paleolithic man could only make the most basic stone tools.

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到了新石器时代，中国人的祖先就会制造工具了。

In the Neolithic Age, the ancestors of the Chinese people were able to make tools.

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到了新石器时代，中国人的祖先就会制造工具了。

In the Neolithic Age, the ancestors of the Chinese people were able to make tools.

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