Screw pump should be in suction stop valve fully open under the condition of starting, in case of overload or empty.

螺杆泵应在吸排停止阀全开的情况下起动，以防过载或吸空。

youdao

Pump stop, they would first close the discharge stop valve, and switch to a complete halt until pump suction stop valve was closed.

泵停车时，应先关闭排出停止阀，并待泵完全停转后关闭吸入停止阀。

youdao

The suction cup on the back keeps the commuter's head in place, while a message on the front asks fellow passengers, "Could you please wake me up when I reach the stop printed below?"

头盔后方的吸盘可以保证通勤者的头部固定在一个位置，头盔的前部有一个小纸条告诉同车的乘客”在列车到达下面所写的这一站的时候，麻烦你能叫醒我么？

youdao