游泳时要注意保持身体的核心部分稳定。

When swimming, keep your ___body core stable.

这只狗身体瘦削，腿短。

The dog had a thin ___body and short legs.

我看到一只蜘蛛，腿很长，身体又胖又圆。

I saw a spider with long legs and a fat, round ___body.