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We always have to flush the public toilet before we get out of the stall. It can't be avoided to see something we don't want to see in the toilet when we turn round to press the flush trigger. And we always can find that someone forget to flush the public toilet in developing country. So we redesign the handle of the door to be a flush trigger. When you open the door, the toilet flushed with water. You need not to turn round and no one will froget to flush the toilet.
Ningbo University of Technology