wel·ter·weight /ˈwɛltɚ/
  輕中量級選手
  Wel·ter·weight n.
  1. Horse Racing A weight of 28 pounds (one of 40 pounds is called a heavy welterweight) sometimes imposed in addition to weight for age, chiefly in steeplechases and hurdle races.
  2.  A boxer or wrestler whose weight is intermediate between that of a lightweight and that of a middleweight.
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  welterweight
       n 1: a weight of 28 pounds; sometimes imposed as a handicap in a
            horse race (such as a steeple chase or hurdle race)
       2: an amateur boxer who weighs no more than 148 pounds
       3: a wrestler who weighs 154-172 pounds
       4: a professional boxer who weighs between 141 and 147 pounds