oblig·a·to·ry /əˈblɪgəˌtori, ɑ, ˌtɔr ||ˈɑblɪgə-/
 (a.)義不容辭的,義務的,必須的


 oblig·a·to·ry /əˈblɪgəˌtorɪ, ɑ, ˌtɔr , ˈɑblɪgə-/ 形容詞
 義務的,專性的


 Ob·li·ga·to·ry a.  Binding in law or conscience; imposing duty or obligation; requiring performance or forbearance of some act; -- often followed by on or upon; as, obedience is obligatory on a soldier.
    As long as the law is obligatory, so long our obedience is due.   --Jer. Taylor.

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 obligatory
      adj 1: morally or legally constraining or binding; "attendance is
             obligatory"; "an obligatory contribution" [ant: optional]
      2: required by obligation or compulsion or convention; "he made
         all the obligatory apologies"