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When people sweeping, they often worry about that the dust inside will spill out. So they have to press the broom on the dustpan to stop that happening.
Cap dustpan can stand up to avoid dust spilling out by a folding action. It is also convenient to bring up to pour the dust into the dustbin.
Meanwhile, on the way to the dustbin, people will no longer worry about the dust spilling on the floor, because the dustpan has a cap now.
Cheng Qiying, Gu Shaoting, Cai Juexiao, Le Yiyan