In the middle of the bridge, there is a bright firedamp light like an electric lamp.
在桥的中间，有一盏明亮的沼气灯，像一盏电灯。
It is like turning on an electric lamp. A person who does not know about electricity will try at the bulb instead of the switch, so the lamp does not light.
这和开灯类似，不懂电的人，会去试灯泡而不知道去打开开关，所以灯不会亮。
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