1. The child was bare to the waist.
    那孩子打赤膊。

2. Some bamboo is thinner than your little finger. Some is much thicker than your waist.
    某些种类的竹子比小手指还细. 某些则比腰还要粗得多.

3. Gaston pulled the sleeve of his wife's dress, gathered his arms around her waist and looked merrily into her troubled eyes.
    加斯顿拉了拉妻子的衣袖，双手搂着她的腰，快乐地望着她那充满困惑的眼睛。