Even though, the boy liked to bounce up and down.

尽管如此，男孩还是喜欢上下弹跳。

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The head should not bounce up and down during this drill.

在做这个训练的时候，头部不允许上下移动。

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Patient: Why do you ask me to bounce up and down on my bed?

病人：为什么你让我在床上上下蹦跳呢？

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"The ones that are large, dark or old--they're dead, " he says, watching two pit bulls bounce up and down.

FORBES: Magazine Article

But, for example, whereas market-risk models can be tested every day as markets bounce up and down, credit-risk models have to be tested over the economic cycle.

ECONOMIST: Banking regulation

With passenger revenues stagnant, MTRC's bottom line depends a lot on proceeds from the sale of property atop its stations, which tend to bounce up and down.

CNN: Hong Kong Packs the Train