形容詞 useful:

1. being of use or service
   同義詞：utile
2. having a useful function
   同義詞：utilitarian

1. 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。
2. It's more useful to learn modern languages, such as English and German, than Latin.
   學(xué)習(xí)英語(yǔ)和德語(yǔ)等現(xiàn)代語(yǔ)言比學(xué)習(xí)拉丁語(yǔ)更為有用。
3. 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。
4. This book is a storehouse of useful information.
   這本書(shū)里匯集了大量有用的資料。
5. He's a useful member of the team.
   他是該隊(duì)的一名強(qiáng)手。
6. This reference book is very useful to our study.
   這本參考書(shū)對(duì)我們的研究很有用。
7. She is a useful person to know.
   她是個(gè)應(yīng)該結(jié)交的有用的人。