The electrification of Europe and America in the late 19th century sparked the use of storage batteries for telegraphy, portable electric-lighting systems and back-up power.
在19世纪晚期，欧洲和美国的电气化进程开始将蓄电池大规模用于电信技术、便携式电灯系统和后备电源。
The researchers say that their observations offer the first clear glimpse at how the most massive galaxies took shape, way back when the earliest stars and galaxies were lighting up the universe.
研究人员表示，他们的观察让人们第一次清晰地看到了最大规模的星系是如何形成的，让人们回顾了最早的恒星和星系照亮整个宇宙的时刻。
Adequate emergency lighting (with a battery back-up) should be installed throughout the factory.
整个工厂需安装有足够的紧急照明系统(带有备用电池)。
Adequate emergency lighting (with a battery back-up) should be installed throughout the factory.
整个工厂需安装有足够的紧急照明系统(带有备用电池)。
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