B
生物医药大词典
by MedSci
菜单
词典
分类
百科
诗词
背单词
英文名
DeepEvidence ↗
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例句 /
A piece of flint used as a tool by primitive human beings.
A piece of flint used as a tool by primitive human beings.
打火石原始人作为工具用的一块打火石