1、 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.
来源:辞典例句
2、 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.
来源:互联网
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