before the lights

To see if the treatment actually worked, two groups of mice, one with sight and one blind, were placed in dark cages for half an hour before the lights were turned on.

为了证实这样的处理是否有效，将两组小鼠，一组正常一组失明，在灯光打开之前至于黑匣子中半小时。

Our house is the alst one on the left before the traffic lights.

我们的房子是红绿灯前面的左边最后一家。

In one Beijing theater, moviegoers hoping to see the tale of a 19th-century former slave wreaking bloody vengeance across the American South saw only moments of the film before the lights came back on.

在北京的一家影院，影迷原本希望看到一名获得自由的奴隶在美国南方展开血腥报复的故事，结果才看了几个镜头影院的灯就亮了。

He had time to finish these letters before the lights were put out.

熄灯之前他写完了信.

Open all windows in the morning and close them before turning on the lights.

每天早上打开窗户，每天晚上开灯时分关上窗户。

Before they turn the lights out

在他们熄灭所有的灯火之前

It was an hour before the lights came on again.

一个小时后灯才再亮了。