Use your hand to power the hoop in a back-and-forth motion: the hoop will alternate between hitting the center of your palm and the back of your hand.
用你的手来给呼啦圈前后移动的力：呼啦圈会在你的手掌心和手背上交替着力。
Through the design of bending die for the back hoop of silencer, die design analysis and die structure for large cylinder part considering springback compensation was introduced.
通过对消音器后环箍弯曲成形模的设计，介绍了考虑弹复补偿后，较大圆筒件成形模具的设计分析和模具结构。
The hoop can be sleeved at the outer side of the opening formed at the front casing and the back casing, with a top end forming a slightly contracting opening.
包括由塑料制成的前壳体、后壳体和箍儿，箍儿可 套在前壳体和后壳体形成的开口处外侧，其上端形成有稍为收缩 的开口。
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