一旦所有三个开关打开(按顺序)的主灯将发光红色。
Once all three switches are turned on (in order) the Main light will glow red.
安装主前照灯，然后执行功能测试。
主保险丝断了，这个楼的灯都黑了。
The master fuse blew out, and all the lights went off in the building.
主保险丝断了，这个楼的灯都黑了。
The master fuse blew out, and all the lights went off in the building.
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