“分子式”造句

水的化学分子式是H2O.
The chemical formula for water is H 2 O.

测得的准确分子量与具体的分子式完全吻合.
The precise molecular weight that is measured can be uniquely associated with a specific moleculer formular.

仅从分子式, 我们就能推断分子中的 “ 不饱和度 ”.
From the molecular formula alone , we can deduce the " degrees of unsaturation " in the molecule.

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