pro·long /prəˈlɔŋ/
 (vt.)延長,拖延,拖長
 Pro·long v. t. [imp. & p. p. Prolonged p. pr. & vb. n. Prolonging.]
 1. To extend in space or length; as, to prolong a line.
 2. To lengthen in time; to extend the duration of; to draw out; to continue; as, to prolong one's days.
    Prolong awhile the traitor's life.   --Shak.
    The unhappy queen with talk prolonged the night.   --Dryden.
 3. To put off to a distant time; to postpone.
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 prolong
      v 1: lengthen in time; cause to be or last longer; "We prolonged
           our stay"; "She extended her visit by another day"; "The
           meeting was drawn out until midnight" [syn: protract,
           extend, draw out]
      2: lengthen or extend in duration or space; "We sustained the
         diplomatic negociations as long as possible"; "prolong the
         treatment of the patient"; "keep up the good work" [syn: sustain,
          keep up]