So it can detect whether the knife is slicing, whether it's scraping or what.
所以它能探测出刀是不是在切片，是不是在削之类的。
The portress set to scraping away the grass from what she called her pavement, with an old knife, and, as she tore out the blades, she grumbled
看门的女人用一把旧刀，把门前被她称作是她的铺路石石缝里长出的青草除去，一边除一边嘟囔着
He cleaned the wire by scraping it with a knife.
他用小刀把这根电线皮剥掉。
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