jack-knife

例句：

1. 1.She used a jack-knife to cut the rope.
   她用一把剪刀剪断了绳子。
2. 2. The jack-knife is an essential tool for carpenters.
   剪刀是木匠们必备的工具。
3. 3. He used his jack-knife to open the lock on his car.
   他用他的剪刀打开了他汽车的锁。