我们通常需要很长时间才能真正掌握一项技能。
It usually takes us quite a long time to truly master a skill.
然而，一项新的研究表明，欧洲祖先们知道很后来才真正掌握生火技能。
But new research says those initial Europeans may not have been fire experts until much later.
然而，一项新的研究表明，欧洲祖先们知道很后来才真正掌握生火技能。
But new research says those initial Europeans may not have been fire experts until much later.
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