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。
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, because this is easier to shape than other kinds.
然而，幸运的是古人类用石头制造工具，尤其是燧石，因为石头比其他物质更容易成形。
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