巨大的气球在上空上下浮动。

Huge balloons bobbed about in the sky above.

《柯林斯英汉双解大词典》

另一些股票可能上下浮动，因为它们反复无常。

And other stocks might jump up and down a lot because they're very volatile.

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这个浮子在水中上下浮动。

The float bobs up and down in the water.

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事实上，它是随着海浪上下浮动的一组筏。

They move up and down on the waves.

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太阳的活动通常在一个还算规则的周期内上下浮动。

The sun's activity usually ebbs and flows on a fairly predictable cycle.

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太阳的活动通常在一个还算规则的周期内上下浮动。

The sun's activity usually ebbs and flows on a fairly predictable cycle.

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