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。
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。
When a collision occurs, the shoulder belt tightener compensates for "belt slack" and "film-reel effect" by retracting and tightening the belt strap.
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