这可以锻炼你腹部的肌肉。

This develops the muscles in your stomach region.

锻炼肌肉使孩子更强壮更健康。

Building muscles makes kids stronger and healthier.

这可以锻炼你的胸部和肩部肌肉。

This develops your chest and shoulder muscles.

不同的锻炼，如举重或使用呼啦圈，有助于学生锻炼肌肉。

Different exercises, such as lifting weights or using hula hoops, help students build muscles.

由于缺乏重力，宇航员的骨骼和肌肉在太空中会变得非常虚弱。

Astronauts' bones and muscles can get very weak in space due to the lack of gravity.