"We know things are really bad when the light goes out," says Dr Widder.

“我们知道当光线暗的时候，事情就不妙了(指污染严重)，”韦德博士说道。

youdao

Press this button when the light goes on--you'll soon get the hang of it.

灯光亮时按这个按钮，你很快就会掌握决窍的 追答 窍和孔没有区别 追问 太…

youdao

When you come into a room, you flip the light switch, and the light goes on.

当你进屋，轻轻按下电灯开关，而灯亮了。

youdao

So where to shop when the red light sale goes into effect?

FORBES: Make A Shopping List For Lower Stock Prices

When the sun goes down, crossing the line between the City of Light and the City of Darkness is eerie, almost post-apocalyptic: moving within minutes from the bright lights of Times Square to the narrow unlit streets of the Financial District with the looming outlines of skyscrapers towering overhead.

BBC: Storm Sandy: New York's dark and bright sides

But consider what happens when the power goes out -- when, without warning, we lose artificial light.

CNN: When May 19 became the day of darkness