在电灯发明之前，点灯人每晚都要在街道上点亮煤油灯。

Before electric lights, ___lamplighters lit the kerosene lamps on the streets every evening.

这些科学家就像是文明的点灯人，照亮了知识的黑暗角落。

These scientists are like ___lamplighters, illuminating the dark corners of knowledge.