bobbing
[bɒbɪŋ]
n.
（显示器射线管屏幕上的）标记干扰性移动;
v.
使上下（或来回）快速摆动( bob的现在分词 );
剪短（头发）;
截短（尾巴）;
轻敲;
例句:
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The small boat was bobbing on the rough water of the lake.
小船在汹涌的湖面上下摆动.
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A little bird was bobbing its head up and down.
一只小鸟把头上下快速摆动着.
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" Please , Sir, missis has made tea,'said a female servant, bobbing into the room.
一个女用人走进房来说, “ 先生, 太太已经泡好了茶. ”
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I am bobbing about in a child's rubber ring.
来自THETIMES
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But the head bobbing was in sync with the music.
来自SA
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No bobbing, no weaving no wasted motion at all.
来自NEWYORKER