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。
There's not much bounce left in these balls.
这些球已没有多少弹性了。
As a result, I am not sure that exports are going to bounce back quickly.
因此我不能肯定出口会马上卷土重来。
As a result, I am not sure that exports are going to bounce back quickly.
因此我不能肯定出口会马上卷土重来。
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