slice 作动词的意义有：
1.make a clean cut through; "slit her throat"
2.hit a ball and put a spin on it so that it travels in a different direction
3.cut into slices; "Slice the salami,please"
4.hit a ball so that it causes a backspin strike
看第一个例句,所以句子翻译为：她用开信刀划破了自己的手.