n. shrink-ring
misc. straining ring
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.
调整密封圈的押紧程度，可以获得最佳密封效果。
对于推力轴承，与轴紧配合并一起运动的称轴圈，与轴承座或机械壳体孔成过渡配合并起支承作用的称座圈。
For thrust bearings, and shaft tight and together with the movement of said shaft washer, and bearing or mechanical shell holes into the transition and play supporting role with the said seat.
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