knife英 [naɪf] 美 [naɪf]n.刀;匕首;刃部;手术刀vt.切割，刺;伤害vi.劈开;划过双语例句：Two robbers broke into her home, held a knife to her throat and stole her savings.两个盗贼闯进了她的家，把刀架在她的脖子上，抢走了她的积蓄。