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When a child is born in a family, you may buy something to assist his life, such as, climming ladders to children`s hand conviently. But when the child is grown up, the things you buy will be useless.
This design is that changing the positive and negative conversion cabinet drawer to wash their hands with in the demand period,and collect in the other time.It is the shoulder for your childen.
Zhejiang Sci-Tech University