轻重量级拳击手

例句：

1. 1. He is a lightweight boxer who won the championship last year.
   他是去年赢得冠军的轻量级拳击手。
2. 2. This lightweight suit is designed for men in their 40s and 50s.
   这款轻量级西装是为40至50岁男性设计的。
3. 3. The lightweight bike is perfect for commuting on busy city streets.
   这款轻便自行车非常适合在繁忙的城市街道上通勤。