Fluorescent lights, which consist of tubes filled with mercury vapour, are roughly four times more efficient.

灯管中充上水银蒸汽的荧光灯比它的功效高大约四倍。

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An entrepreneur flipped on the lights in her tech startup, and did her part to add to the more than 8 million new jobs our businesses have created over the past four years.

企业家在她的技术创业公司夜以继日，为过去四年来增加800万新的就业岗位尽职尽责。

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Lights: Ten bundles of LED lights will illuminate the deep five times as efficiently as the previous bulbs and last four times as long-five years or more.

照明灯：十束led灯照亮深海。它的效率是从前用的灯泡的五倍，使用时间是从前的四倍——可用五年以上。

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The Mayor of Carmel, Jim Brainard, has become America's evangelist-in-chief on the matter, demolishing 78 sets of traffic lights and replacing them with those round islands so familiar to drivers in the UK. Four more will be finished in the coming months.

BBC: Is the British roundabout conquering the US?