The flu outbreak is starting to affect the tourism industry, with one major airline announcing plans to scale back services between Australia and Japan by one-third because of a slump in demand from Japanese passengers.

VOA: standard.2009.05.30

As time increases, the angle increases and we can ask, "How long does it take for the particle to come back to the starting point?"

这个角度随着时间在增加,我们会问,"质点需要多长时间,才能转到起点"

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so, we did get it back to the starting position.

所以，我们让它返回起始位置。

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