The database could be used as a teaching resource in colleges.

　　數據庫可以用作大學里的一種教學輔助手段。

　　You used to see a lot of her, didn't you?

　　你過去常見她吧？

　　They had got too used to the soft life at home.

　　他們實在是過慣了家里的安逸生活。

　　I used a long exposure for this one.

　　我這張照片用的曝光時間長。

　　I read much less now than I used to.

　　我現在看的書比過去少得多。

　　Am I right in thinking that you used to live here?

　　我想你過去在這里住過，對嗎？