易混淆的单词： Bobbing

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He is bobbing for automobile parts in a large pool of dirty water .

他正在敲打着汽车零件在一大滩肮脏的水中。

Bobbing in warming waters , this ancient ice fossil will be gone in a couple of weeks .

在日益变暖的海水拍击下，这块古老的冰化石将在几个星期内消失。

His feet are barely getting off the ground , his head keeps bobbing .

他的脚几乎没有离开地面，而头则不断摆动。

Arm swings have the added benefit of keeping our heads from bobbing back and forth as we walk , he adds .

他又说，摆臂还有一个好处，那就是使得我们的头部不至于晃前晃后。

Two weeks earlier , police responded to a report of something unusual bobbing on the surface . The object was a female body part .

两周前，警察接到了水面飘着奇怪的东西的报告，发现那是一具女尸的一部分。