bobbing

I could see his ginger head bobbing about.

我可他黄袋在上下移动。

The small boat was bobbing on the sea.

小船在海里上下摆动。

A little bird was bobbing its head up and down.

一只小鸟把头上下快速摆动着。

The small boat was bobbing on the rough water of the lake.

小船在汹涌湖面上下摆动。

It's the late 1940S,people flew in an aerocar,a car that could turn into an airplane, on TV's "love that bob" show.

在1940年代晚期，，车子可转变成飞机，在电视。