In early times men made tools out of stone.
在远古时期，人们用石头来制造工具。
Fortunately, however, ancient men made tools of stone, especially flint.
然而，幸运的是，远古人用石头制作了工具，特别是用燧石。
Ancient men made tools of stone.
古代的人制作了石头工具。
Primitive man made tools from sharp stones and animal bones.
原始人用尖石块和动物的骨制造工具。
Fortunately, however, ancient men made tools of stone, especially flint.
然而，幸亏古代人制造了石头工具，尤其是燧石。
Fortunately, however, ancient men made tools of stone, especially flint.
然而，幸亏古代人制造了石头工具，尤其是燧石。
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