当液压杆往上或往下移动而且无压住任何物体时压力表指针不会显示。
When the hydraulic pole move up or down and without compressing anything then the index of pressure meter without showing the pressure.
压力表上的指针甚至摆动到了红线外面。
The needle on a pressure gauge twitches ever further into the red.
水泵不吸水，压力表及真空表的指针在剧烈摆动。
Pump could not suction water. The fingers of pressure gauge and vacuum gauge swing acutely.
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