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valency    
n. 原子价

原子价

valency
n 1: the phenomenon of forming chemical bonds
2: (biology) a relative capacity to unite or react or interact
as with antigens or a biological substrate [synonym: {valence},
{valency}]
3: (chemistry) a property of atoms or radicals; their combining
power given in terms of the number of hydrogen atoms (or the
equivalent) [synonym: {valence}, {valency}]

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