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

尽管如此，男孩还是喜欢上下弹跳。

2·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。

3·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？

4·Medicine 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？

5·A raisin dropped in a glass of fresh champagne will bounce up and down continuously from the bottom of the glass to the top.

一粒葡萄干落入一杯新酿的香摈中时，它会从杯底到杯口不断地上下跳动。

6·The vibrations can cause houses to slide off their foundations, and can make buildings contract, expand, shake from side to side, and bounce up and down.

震动会使房屋滑出它们的建筑，会使建筑物收缩、廓张，两边摇晃，和上下弹跳。

7·The ring will jump up the core and, if it does not fly clear of the core, will bounce up and down in a swing-like manner, finally coming to rest at a point some distance up the core from the coil.

环会跳起来的核心，如果它不飞的核心明确，将反弹向上和向下挥杆样的方式，终于来到休息点一些，从线圈核心的距离。

8·Normal swells, known technically as gravity waves, are created by wind pushing the surface of the sea up and gravity then pulling it down, causing it to bounce.

一般的波浪，技术上被成为重力波，是由于风推动着海洋表面上升而后又在重力的作用下被拉向下方，这便会导致海水的回弹。

9·Now I'm going to drop them together vertically down, and then this ball will bounce up somehow.

现在我将要把它们同时垂直投下，然后球会以某种方式弹起。

10·Answer: If you bounce when you run, your head and body are moving up and down too much, which wastes a lot of energy.

答：如果跑步有弹跳，您的头和身体上下移动幅度太大，这样会浪费许多能量。