is·en·tro·pic /ˌaɪsṇˈtropɪk, ˈtrɑ-/
  等熵; 等熵的; 等熵線
  I·sen·trop·ic a.  Physics Having equal entropy.
  Isentropic lines, lines which pass through points having equal entropy.
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  isentropic
       adj : with unchanging entropy; at constant entropy