资料来源 : pyDict

减光板

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Weakener \Weak"en*er\, n.
   One who, or that which, weakens. ``[Fastings] weakeners of
   sin.'' --South.

资料来源 : WordNet®

weakener
     n : that which weakens or causes a loss of strength; "doubt is a
         great weakener of resolve"