Motorists were forced to turn on their headlights at midday.
驾车者被强制要求在正午打开前灯。
Turn on the headlights, she repeated, and without waiting for a response she leaned over and did it herself.
把前灯打开，她重复道，没等我的答复她就侧过身来自己打开了前车灯。
For someone standing outside watching the ship fly by, the headlights do not appear to turn on: light comes out but it takes an eternity for the beams to get ahead of the spaceship.
可是对站在飞船之外、正在观看飞船运行的人们来说，这个车头灯并没有点亮：车头灯所发出的光到达观察者需要无穷大的时间，因为要求车头灯所发出的光束的速度超过以光速运行的飞船是不可能的。
On several occasions, pollution combined with fog has been so bad that motorists have had to turn on their headlights in the middle of the day.
还有好几次是污染伴随着大雾，糟糕到大中午汽车都得开前灯才行。
If you're in a vehicle going the speed of light, what happens when you turn on the headlights?
如果你开著以光速行进的车，打开车灯的时候会发生什么事？
With the emergency brake remaining "set" have the truck driver turn on and test the headlights both high and low beams, both left and right front signal lights and the windshield wipers.
将刹车继续“放”在紧急制动档，让驾驶员使卡车转弯，以此试一下车辆的前照灯，包括大灯、小灯、左侧和右侧信号灯以及挡风玻璃刮水器等。
With the emergency brake remaining "set" have the truck driver turn on and test the headlights both high and low beams, both left and right front signal lights and the windshield wipers.
将刹车继续“放”在紧急制动档，让驾驶员使卡车转弯，以此试一下车辆的前照灯，包括大灯、小灯、左侧和右侧信号灯以及挡风玻璃刮水器等。
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