three-cornered
  (a.)三角的,由三人爭取第一名的
  Three-cor·nered a.
  1. Having three corners, or angles; as, a three-cornered hat.
  2. Bot. Having three prominent longitudinal angles; as, a three-cornered stem.
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  three-cornered
       adj 1: having three corners; "a three-cornered hat"
       2: involving a group or set of three; "a three-cornered race"