de·mon·stra·tive /dɪˈmɑn(t)strətɪv/
 (a.)說明的,指示的


 De·mon·stra·tive a.
 1. Having the nature of demonstration; tending to demonstrate; making evident; exhibiting clearly or conclusively. “Demonstrative figures.”
    An argument necessary and demonstrative.   --Hooker.
 2. Expressing, or apt to express, much; displaying feeling or sentiment; as, her nature was demonstrative.
 3. Consisting of eulogy or of invective. “Demonstrative eloquence.”
 Demonstrative pronoun Gram., a pronoun distinctly designating that to which it refers.


 De·mon·stra·tive, n. Gram. A demonstrative pronoun; as, “this” and “that” are demonstratives.

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 demonstrative
      adj 1: given to or marked by the open expression of emotion; "an
             affectionate and demonstrative family" [ant: undemonstrative]
      2: serving to demonstrate [syn: illustrative]
      n : a pronoun that points out an intended referent [syn: {demonstrative
          pronoun]