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When useing a basin to wash, we often pour a full of water into it. However, we don't need too much water to use or wash things
and it'll easily spill out as well. In order to attention people to save water and to aviod splashing, we design four small holes at the upper place. If the surface of water overrun the places of holes, it'll flow out. Therefore, this design tell people what you want is not what you really want. Then more water would be saved.