orienting knob

• 方位手柄

orienting knob的用法和样例：

例句

1. Twist the knob to the left to open the door.
   向左转动手柄把门打开。
2. The rheostat is operated by rotating the control knob, separating it from the push-pull action of the main lighting switch.
   可变电阻器由旋转的控制手柄操纵，与灯光总开关的推一拉的操纵是分开的。