my mother cut the cake（介词）a knife

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mymothercutthecake（介词）aknifemymothercutthecake（介词）aknifemymothercutthecake（介词）aknife填with用、使用

my mother cut the cake（介词）a knife
my mother cut the cake（介词）a knife

my mother cut the cake（介词）a knife
填with 用、使用