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奶奶年纪大了,又有高血压。她每次擦地板时都要俯下身,用拖把吃力地来回擦,累得腰酸背疼。我想发明一种智能擦地板机,它可以用遥控器来控制
Grandma is old and has high blood pressure. Every time she wiped the floor, she had to leaned over and rubbed hard with a mop, tired and backache. I want to invent an intelligent floor wiping machine that can be controlled with a remote control