1. 肌肉的;影响肌肉的
    Muscular means involving or affecting your muscles.

    e.g. As a general rule, all muscular effort is enhanced by breathing in as the effort is made...
           通常，肌肉的力量能通过使劲儿吸气增强。
    e.g. Early symptoms include anorexia, muscular weakness and fatigue.
           早期症状有厌食、肌无力和疲劳。

2. 肌肉结实的;强壮的
    If a person or their body is muscular, they are very fit and strong, and have firm muscles which are not covered with a lot of fat.

    e.g. Like most female athletes, she was lean and muscular.
           像大多女运动员一样，她清瘦但肌肉发达。
    e.g. ...his tanned muscular legs.
           他那肌肉发达、肤色黝黑的双腿