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。
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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