cop·u·la /ˈkɑpjələ/
  連繫辭,介體,接合部
  cop·u·la /ˈkɑpjələ/ 名詞
  (拉)聯合突,連接體
  Cop·u·la n.
  1. Logic & Gram. The word which unites the subject and predicate.
  2. Mus. The stop which connects the manuals, or the manuals with the pedals; -- called also coupler.
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  copula
       n : an equating verb (such as `be' or `become') that links the
           subject with the complement of a sentence [syn: copulative,
            linking verb]
       [also: copulae (pl)]