di·va·lent /(ˌ)daɪˈvelənt/
  (a.)二價的
  di·va·lent /(ˈ)daɪˈvelənt/ 形容詞
  二價的
  Div·a·lent a.  Chem. Having two units of combining power; bivalent.  Cf. Valence.
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  divalent
       adj : having a valence of two or having two valences [syn: bivalent]