Each bucket has a different type of clothing in it — one bucket contains all the shoes; another bucket contains all the pants; another has all the jackets; another the dresses.
每个木桶装一种不同类型的衣服——一个木桶装所有的鞋子；另一个装所有的裤子，另一个装所有的夹克，另一个装裙子。
The culprit may be weak back muscles, the type of surface on which you run, the shoes you wear, or the length of your running stride.
其原因可能是背部肌肉太弱，也可能是你奔跑的路面有问题，还可能是你穿的鞋不合适，也许是因为你的步幅不对。
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