1. Coal oil was widely used in lamps before electricity became common.
在电力普及之前，coal oil被广泛用于灯具照明。

2. The old house still had a bottle of coal oil in the storage room.
那座老房子的储藏室里仍有一瓶coal oil。

3. People once relied on coal oil for lighting at night.
人们曾依靠coal oil在夜间照明。

4. Coal oil has largely been replaced by modern fuels.
coal oil已经基本被现代燃料取代。

A: What is coal oil used for?
A：coal oil是用来做什么的？

B: It was mainly used for lighting in the past.
B：过去主要用于照明。

1) 早期石油提炼的照明燃料
2) 常见于历史工业和能源发展描述
3) 与煤油概念接近或同源
4) 现代已很少使用

1. 煤油（旧称）：指早期从石油中提炼用于照明的燃料

e.g. Coal oil was used in lamps in the 19th century.
19世纪人们用coal oil点灯。

noun

1. An old term for a type of petroleum-derived oil, historically used as a fuel for lamps and lighting before electricity became widespread.

Synonym: kerosene, lamp oil