軸環置於軸外，用作固定塊，用於在軸上定位各零件。 它是軸的一部分，可以拆卸。
軸套放置在軸外以減少軸旋轉時的摩擦和磨損。 它不是軸的一部分，不能拆卸。

Bushing

The Shaft Ring is placed on the outside of the shaft and serves as a fixed component for positioning various parts on the shaft. It is a part of the shaft and can be removed.

The Shaft Sleeve is placed on the outside of the shaft to reduce friction and wear during shaft rotation. It is not a part of the shaft and cannot be removed.