With Velox, they could rely on artificial light, which at the time usually meant gaslight but soon came to mean electric.
有了Velox，他们可以依赖人造光，如当时通常用的煤气灯，以及不久后出现的电灯。

Gaslights cast a shadowy glow.
煤气灯投下一片片幽暗得光。

What a glorious discovery is the gaslight!
煤气灯是一项多么了不起得发明啊!

In the era of gaslight
在煤气灯的时代

In the gaslight she looked paler than ever.
在煤气灯光下她显得比以往任何时候都苍白。

He sat.staring at the yellow, singing gaslight
他坐在那里，眼睛直望着煤气灯那唧唧低吟的黄色火焰。

He sat staring at the yellow, singing gaslight.
他坐在那里，眼睛直望着那煤气灯唧唧低吟的黄色火焰。

True that it passes muster by gaslight, but the sunlight shows it up.
他们会说, 在煤气灯下看看还凑合, 一到阳光下就现形了。

The gaslights in the passage would be on, turned low.
走廊里的煤气灯应该是开着的，调得比较暗。