It is a good idea to avoid this problem by using only empty directories as mount points.
要避免这类问题，一个较好的办法就是只使用空目录作为挂载点。
This is the only empty room in the hotel.
这是旅馆里惟一一间空房间。
All the other dogs were harnessed and the only empty place was now the one at the front.
所有其它的狗都套好了，现在唯一空出的就是最前边那个位置。
All the other dogs were harnessed and the only empty place was now the one at the front.
所有其它的狗都套好了，现在唯一空出的就是最前边那个位置。
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