At the same time, huge diamond shaped lights also function as the maintenance openings, creating a visually more pleasing ceiling surface to the viewers.

同时，大菱形灯还充当这天花维修孔的角色，极大的美观了天花效果。

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Working too long, people will appear eye fatigue, car is no exception. Look at the daily maintenance and repair of the car lights...

工作时间太长，人会出现眼疲劳，汽车也不例外。下面一起看看汽车车灯日常的保养和维修。

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Such tasks include opening and closing the garage door, starting the engine, and stopping at traffic lights, in addition to putting oil and gas in the car and performing periodic maintenance.

这些任务包括打开和关闭车门、开动引擎、在红绿灯面前停车，为车加油及进行定期的养护。

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The other 144 is utterly essential to keep lights on when unexpected demand arises from heat waves, outages or maintenance downtime.

FORBES: Brownout

The batteries are not essential during flight as they are mainly used on the ground during maintenance activity, Sinnett said, such as providing navigation lights and braking while the airplane is towed.

CNN: Boeing announces changes to Dreamliner battery system

The lights will be more visible to drivers in sunny conditions and require less maintenance so they are cheaper to run.

BBC: Cumbria traffic light improvements begin