When you turn the ignition key on, but before you start the car, the oil light should light, indicating that there is no oil pressure yet, but also letting you know that the warning system is working.
当你打开点火开关，在启动车子之前，油量警示灯亮，表明此时无油压力，同时也让你知道报警系统已开始工作。
Liquid system is the need for oil pressure, flow, direction control and regulation to meet the needs of working parts in the power, speed and direction requirements.
液正系统工作，必须对油液压力、流量、方向进行控制与调节，以满足工作部件在力、速度和方向上的要求。
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