floor plug wax 地板蜡
Plug the hole with wax or silicone, then screw the bulb into a socket and let someone walk into the room and throw the switch.
把那个洞用蜡或硅酮封住，之后把灯泡重新旋入插座，静候等某人走入房间，打开开关。
The plug-up of the crude oil gathering line due to wax condensation is a common trouble occurring in the oil field.
油田集油和输油管线冻（凝）堵是油田生产常见故障之一。
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