1. The diver performed a perfect jackknife off the high dive.
跳水员在高台上做了一个完美的折刀式跳水。

2. Be careful not to jackknife the trailer when making sharp turns.
转弯时要小心不要让拖车折成折刀形状。

3. The truck jackknifed on the icy road, causing a major traffic jam.
卡车在冰冻的道路上折成折刀形状，造成了严重的交通堵塞。

4. The chef demonstrated how to jackknife a whole fish for cooking.
厨师演示了如何把整条鱼折成折刀形状来烹饪。

5. The gymnast executed a flawless jackknife on the balance beam.
体操运动员在平衡木上做了一个完美的折刀动作。

6. The jackknife is a versatile tool that can be used for a variety of tasks.
折刀是一种多功能工具，可以用于各种任务。