subsidence
 沈澱,下沈,陷沒
 sub·si·dence /səbˈsaɪdṇ(t)s, ˈsəbsədən(t)s/ 名詞
 減退,沉降,消退,衰耗,沉下,下沉,陷落
 Sub·sid·ence Sub·sid·en·cy n.  The act or process of subsiding.
    The subdual or subsidence of the more violent passions.   --Bp. Warburton.
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 subsidence
      n 1: an abatement in intensity or degree (as in the
           manifestations of a disease); "his cancer is in
           remission" [syn: remission, remittal]
      2: a gradual sinking to a lower level [syn: settling, subsiding]
      3: the sudden collapse of something into a hollow beneath it
         [syn: cave in]