然后，在同一个地方，把它弯回去形成反方向的直角。
Then, at the same place, bend it back to form a right-angle in the opposite direction.
本文对前人的工作进行了回顾和总结，分析了滚弯回弹理论公式产生误差的原因。
In this paper, previous work about the theoretical formula of bending springback has been reviewed and summarized, and the difference between the theoretical and the practical results analyzed.
倒钩：武器或工具，如箭或鱼钩的尖头上按相反方向弯回去的尖钩。
Barb: a sharp point projecting in reverse direction to the main point of a weapon or tool as on an arrow or fishhook.
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