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词汇
chemicat composition
释义
chemicat composition
基本
例句
化学成分
When grass is ensiled it undergoes a rapid change in composition.
牧草一经青贮,其化学成分要发生很大变化。
Finally, a mineral must have definite chemical composition.
再一点是一种矿物必须具有一定的化学成分。
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