jackknifing meaning in English

吊杆失控
放倒
牵引车相对拖车成转角
摺刀切割

Arch spat some more tobacco juice on his boot top and whetted the jackknife blade some more .
阿奇又朝靴面上吐了些烟沫，再把大折刀磨了几下。
What do these course of jackknife have to distinguish
重叠的这些科目有什么区别吗？
With a jackknifed trailer truck , so . .
一辆拖车连环相撞，所以…
With a jackknifed trailer truck , so . .
一辆拖车连环相撞，所以…
With a jackknifed trailer truck , so
一辆拖车连环相撞，所以

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