电石灯的发光原理就是利用电石（化学名称为碳化钙，外观为灰色、棕黄色、黑色或褐色块状固体，是有机合成化学工业的基本原料）与水反应生成乙炔，点燃以后乙炔燃烧发光。
一盏电石灯在咖啡馆的角落里闪烁不定。
In a corner of the cafe, an acetylene lamp gives a flickering light.
借着电石灯的光亮，可以看到十几个人体聚集在三四张桌子的周围。
By the glow of a small carbide lamp one could distinguish a dozen human figures gathered around three or four tables.
可是在平日，他并不觉得这有什么说不过去；有时候揣上它，他还觉得这是一种优越，那些拉破车的根本就用不上电石灯。
But he had never considered this an imposition and had actually sometimes felt a sense of superiority because the pullers of ramshackle rickshaws could not afford carbide lamps.
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