When a collision occurs, the shoulder belt tightener compensates for "belt slack" and "film-reel effect" by retracting and tightening the belt strap.
发成碰撞时,通过牵引和张紧安全带圈带,肩带张紧装置补偿安全带松动和胶片卷轴效应。
Imagine that the strap is tightening inward, pressing the outer arms in against the bones.
想象带子在向里收紧、迎着骨骼向外的力量给臂外侧向内的压力。
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