Then, at the same place, bend it back to form a right-angle in the opposite direction.
然后，在同一个地方，把它弯回去形成反方向的直角。
Using just thumbs and fingers, bend it in the middle to form a right-angle.
只用拇指和手指，从中间把它弯曲成直角。
Using just thumbs and fingers, bend it in the middle to form a right-angle.
只用拇指和手指，从中间把它弯曲成直角。
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