useful用作形容詞的用法例句
It is a useful book and, what is more, not an expensive one.這是有用的書(shū)，更難得的是不貴。
The book contains much useful information.這本書(shū)包含了許多有用的資料。
John always tries to cultivate people who are useful to him.約翰經(jīng)常設(shè)法和對(duì)他有用的人結(jié)交。