reducer coupling

• 缩径接头,缩接,缩径管接头,缩径接管

reducer coupling的用法和样例：

例句

1. The bell reducer provides the cyclone action and the boundary layer control.
   喇叭形异径管产生旋风作用并进行边界层控制。
2. The large opening of the bell reducer keeps air velocity low thus preventing moisture re-entrainment.
   喇叭形异径管的大开口度使空气流量保持较低从而避免把水分再次带走。