knife [naɪf]

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n.小刀，匕首；vt.用刀切割，伤害，切，戳；vi.劈开，穿过

a tool , usually with a metal blade and a handle , used for cutting and spreading food or other substances , or as a weapon

This is a good knife. 这是一把好刀。
Please cut it with a knife. 请用刀子切开它。