体环

例句：

1. 1. The doctor advised him to take a rest and avoid heavy work.
   医生建议他休息并避免重体力劳动。
2. 2. The scientist conducted experiments to study the effects of exercise on thehuman body.
   科学家进行了实验，研究运动对人类身体的影响。
3. 3. The athletes competed in various events, testing their physical abilities.
   运动员参加了各种比赛，测试他们的体能。