钓鱼时，浮标在水面上上下跳动。

The fishing float was ___bobbing on the water surface.

为了在夏天保持凉爽，她把头发剪成了波波头。

She got her hair ___bobbed to stay cool in the summer.

小船在水面上轻轻上下颠簸。

The small boat gave a gentle ___bob on the water surface.

她剪了个波波头，看起来很时髦。

She got a new ___bob and looks very stylish.