Far in back of the huge auditorium, a camera scans the frantic attendees.

在大礼堂后面很远的地方，一架摄像机扫描着疯狂的与会者。

But in back of all this was that nagging.

但在后面的这一切，又是这恼人的。

There is a beautiful tree in back of our house.

我家屋后有颗美丽的大树。

If you want to feel better about your day, buy the guy in back of you at Starbucks a cup of coffee.

如果你想今天过得更开心，那么给你身后的家伙在星巴克买一杯咖啡吧。

The amount of starlight grows until the planet, becoming invisible to Kepler, passes fully in back of its star.

反射的恒星光线会增加，直到这颗行星运行到恒星的正后方，让开普勒观察不到它。