动词短语
中文翻译：Unknown
同义词：
['rolling', 'rubbing', 'sliding', 'scraping']
例句：
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1. The baby's skin was starting to roll as it slept.
宝宝睡觉时，皮肤开始滚动。
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2. As she walked, her skin began to slide along the ground.
她走路时，皮肤顺着地面滑动。
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3.The old man's hands were scraping against the rough surface of the chair.
老人的手在粗糙的椅子表面摩擦。