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The substituent is deuterium.是什么意思？

The substituent is deuterium.

取代基是重氢.

相关词汇
the is deuterium

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

is

vt.& vi. 是（be的三单形式；n. 存在；

deuterium

n. 氘，重氢；
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