在他拐弯回家时，他开始发现空气中有灰末。
As he turned the corner to his home he began to see the ash in the air.
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.
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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