风的方向在不断地变。
但是问题是，在哪个方向上它变的最快呢？
But, the question is, in which direction does it change the most quickly?
如果堵塞住的黏液变稀，你的痰有时会自主向上朝着可以吐出来的方向浮动。
If mucus plugs became very watery, your phlegm would sometimes float upward unaided where it can be spit out.
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