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穿着松散、拖曳的服饰乘用电梯为何宜受伤...

wearing loose, drag dress by use elevator why appro...

为何要求儿童应由有行为能力的成年人陪同...

why children should have required by the ability of...

乘客在乘自动扶梯时为何严禁将头部、肢体...

passengers on why the escalator against the body st...