Sharpened hand tools have been around for twomillion years, yet the earliest spears to be dug up are a mere 400, 000years old and the first effective weapon a mere child at 17, 000 yearsold.
锋利的手动工具在两百万年前已经随处可见，人类挖掘出的最古老的长矛距今有40万年，而第一件有效武器出现在17000年前。
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