Things ain't what they used to be.
現在情況不比從前了。
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。