truncation
  切掉頂端,截頭,截斷
  truncation
  截斷
  Trun·ca·tion n.
  1. The act of truncating, lopping, or cutting off.
  2. The state of being truncated.
  3. Min. The replacement of an edge or solid angle by a plane, especially when the plane is equally inclined to the adjoining faces.
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  truncation
       n 1: the property of being truncated or short [syn: shortness]
       2: the replacement of an edge or solid angle (as in cutting a
          gemstone) by a plane (especially by a plane that is
          equally inclined to the adjacent faces)
       3: the act of cutting short; "it is an obvious truncation of
          the verse"; "they were sentenced to a truncation of their
          limbs"