引导到CWM触摸模式，而不用真的刷入CWM。
这种性能优化延迟磁盘上的物理块的分配，直到块被刷入到磁盘时才进行分配。
This performance optimization delays the allocation of physical blocks on the disk until they are to be flushed to the disk.
当拖动本清扫车时，清扫轮鼓上的清扫刷反方向转动，将垃圾扫入垃圾斗。
A towed sweeper for the street in city is disclosed. The sweeping brushes on the sweeping drum are reversely rotating to sweep the garbage into garbage bucket.
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