原始人用尖石块和兽骨为自己制作原始的工具。

Primitive man made himself primitive tools from sharp stones and animal bones .

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原始人用尖利的石块和兽骨为自己制作原始的工具。

Primitive man made himself primitive tools from sharp stones and animal bones.

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原始人用尖利的石块和兽骨为自己制作原始的工具。

Primitive man made himself primitive tools from sharp stones and animal bones.

youdao