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Halogen atoms contain seven electrons in their valence shell, and , consequently, are monovalent.

卤原子在它们的价电子层含有七个电子, 因此是一价的.

辞典例句

A monovalent vaccine; a monovalent serum.

沙克疫苗是一种不会传染的疫苗.

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But Carol Pandak says the monovalent vaccine is not enough in areas with both.

但卡罗尔.潘达克指出两类脊髓灰质炎的专项疫苗都不充足.

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