ne·ces·si·tate /nɪˈsɛsəˌtet/
  (vt.)迫使,使成為必需,需要
  Ne·ces·si·tate v. t. [imp. & p. p. Necessitated p. pr. & vb. n. Necessitating ]
  1. To make necessary or indispensable; to render unavoidable.
     Sickness [might] necessitate his removal from the court.   --South.
     This fact necessitates a second line.   --J. Peile.
  2. To reduce to the necessity of; to force; to compel.
     The Marquis of Newcastle, being pressed on both sides, was necessitated to draw all his army into York.   --Clarendon.
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  necessitate
       v 1: require as useful, just, or proper; "It takes nerve to do
            what she did"; "success usually requires hard work";
            "This job asks a lot of patience and skill"; "This
            position demands a lot of personal sacrifice"; "This
            dinner calls for a spectacular dessert"; "This
            intervention does not postulates a patient's consent"
            [syn: ask, postulate, need, require, take, involve,
             call for, demand] [ant: obviate]
       2: cause to be a concomitant