im·pede /ɪmˈpid/
  (vt.)妨礙,阻礙,阻止
  Im·pede v. t. [imp. & p. p. Impeded; p. pr. & vb. n. Impeding.]  To hinder; to stop in progress; to obstruct; as, to impede the advance of troops.
  Whatever hinders or impedes
  The action of the nobler will.   --Logfellow.
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  impede
       v 1: be a hindrance or obstacle to; "She is impeding the progress
            of our project" [syn: hinder]
       2: block passage through; "obstruct the path" [syn: obstruct,
           obturate, occlude, jam, block, close up] [ant:
          free]