A guard always stood outside the door to the box.

VOA: special.2009.12.31

She's packing up her things and putting them in a box and she's out the door.

她正把自己所有的东西收拾到一个纸箱里，慢慢走出了门。

I agree课堂 - SpeakingMax英语口语达人

Avatar,the biggest box office success in history, has opened the door for 3-D TV.

VOA: standard.2010.03.11