当阀门处于远程时，位置指示器可用于微动开关接触装置。
On valves controlled remotely, the position indicators may be used for microswitch contact.
此外，由于增设的方向指示器下平面扩大了与地面的接触，提高了球托的整体稳定性。
Besides, the whole stability of the ball buddy is increased since that the lower surface of the added direction indicator enlarges the contact surface with ground.
此外，由于增设的方向指示器下平面扩大了与地面的接触，提高了球托的整体稳定性。
Besides, the whole stability of the ball buddy is increased since that the lower surface of the added direction indicator enlarges the contact surface with ground.
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