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单词 peen
释义 peen
 /peen/,  n.  
  1. a wedgelike, spherical, or other striking end of a hammer head opposite the face.
  v.t.  
  2. to enlarge, straighten, or smooth with a peen.
  3. to strengthen (a metal surface) by light hammering or by bombardment with steel balls or shot.
 [1505-15; earlier pen < Scand; cf. Sw, Norw pen (n.) in same sense (perh. < G Pinne peen). See PIN]
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