Things ain't what they used to be.
现在情况不比从前了。
The database could be used as a teaching resource in colleges.
数据库可以用作大学里的一种教学辅助手段。
You used to see a lot of her, didn't you?
你过去常见她吧？
They had got too used to the soft life at home.
他们实在是过惯了家里的安逸生活。
I used a long exposure for this one.
我这张照片用的曝光时间长。