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It is a waste of time to stare at the water against the overflow when we pour them into the bathtub.If we forgot we were doing this,it would cause some problems like wasting water. “Controlled water” is designed to solve this issue.We can set a level of water before drawing off the water,and then we can do any other things and don’t worry about the overflow of water.When the water are poured to the well-set level just now,it will stop automatically,which largely save time and trouble.
Dalian Minzu University
Dalian Nationalities University