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。

　　I think we could all use a drink after that!

　　我想我們在事情辦完之后都得痛快地喝一杯。

　　He could just make out three people through the mist.

　　透過薄霧他勉強能看出有三個人。

　　The operation could prolong his life by two or three years.

　　這次手術可使他多活兩三年。

　　Only with a few people could she be her real self.

　　只有和幾個人在一起時，她才能表現出真實的自我。