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。

The turn ­ key mass notification system effectively broadcasts information to a targeted audience .

成套的全局通知 系统有效地 将信息广播给目标人群。