useful

adj.

1. 有用的；有益的；实用的；有帮助的
   that can help you to do or achieve what you want
   1. a useful gadget
      有用的小器具
   2. It can be useful to write a short summary of your argument first.
      先把你的论点纲要写下来可能会有帮助。
   3. He might be useful to us.
      我们也许用得上他。
   4. These plants are particularly useful for brightening up shady areas.
      这些植物特别有助于让背光的地方明亮起来。
   5. Don't just sit watching television─ make yourself useful !
      别光坐着看电视——帮一下忙吧！
   6. This information could prove useful .
      这条信息往后也许有用。
   7. Your knowledge of German may come in useful (= be useful in a particular situation) .
      你的德文知识可能会派上用场。
   8. Some products can be recycled at the end of their useful life.
      有些产品过了有效使用年限后是可以回收再利用的。
2. 好的；合格的
   good; of the right standard
   1. He's a very useful player.
      他是个很棒的运动员。

1. ADJ-GRADED 有用的；可用的；有助益的
   If something is useful, you can use it to do something or to help you in some way.
   1. The slow cooker is very useful for people who go out all day...
      慢炖锅对于整天都不在家的人来说很有用。
   2. Hypnotherapy can be useful in helping you give up smoking...
      催眠疗法可能有助于你戒烟。
   3. The police gained a great deal of useful information about the organization.
      警方收集到了大量关于该组织的有用信息。
2. PHRASE 有用；派得上用场
   If an object or skill comes in useful, it can help you achieve something in a particular situation.
   1. The accommodation is some distance from the clubhouse, so a hire car comes in useful.
      住处离会所有一段距离，所以租一辆车会很有用。

1. HDTV is especially useful if there are a lot of special effects.
   有很多特效的时候，高清电视就格外有用了。
2. Alternative treatments can provide a useful back-up to conventional treatment.
   替代疗法能为传统的治疗提供有效的辅助。
3. At the end of this chapter there is a select bibliography of useful books.
   本章末尾列有一份有用的精选书目。
4. From this chastening experience he learnt some useful lessons.
   从这次惨痛的经历中他得到了一些有益的教训。
5. The Shakers believed that furniture should be plain, simple, useful, practical and of sound construction
   震颤派教徒认为家具应当朴素、简单、有用、实用，并且结构合理。
6. Once our services cease to be useful to them, we're expendable
   一旦我们的服务对他们不再有用，我们就可能被抛弃。
7. My mobile phone is extremely useful
   我的手机非常有用。
8. This exercise can be quite a useful ice-breaker for new groups.
   这个活动可以有效地活跃新群体内的气氛。
9. Researchers realised that a tunable laser beam might be useful in surgery.
   研究人员意识到，可调谐激光束也许可以用在外科手术中。
10. The book includes some useful facts about animal and plant life.
    这本书包括了有关动植物的一些有用的知识。
11. It would be useful if you could nail down the source of this tension.
    如果你能弄清这种紧张的根源，将会大有益处。
12. Anger is not necessarily the most useful or acceptable reaction to such events
    对于这种事，发火不见得是最有用或最能被接受的反应。
13. I hope at least my daughter was able to offer you some useful pointers
    我希望至少我的女儿为你提供了一些有用的建议。
14. All of these are quite useful breeds whose potentiality has not been realised.
    所有这些都是十分有用的品种，其潜力还没有被完全发挥。
15. Brick rubble is useful as the base for paths and patios.
    碎砖石可以用来铺路基和庭院地基。
16. I really do not think that an inquiry would serve any useful purpose
    我真的认为调查没有任何实际意义。
17. It is no use simply to tell adolescents to shape up and do something useful.
    仅仅告诉青少年要品行端正，做有意义的事，是没有用的。
18. If you're converting your loft, these addresses will be useful.
    你要是打算改造阁楼，这些地址会派上用场。
19. The slow cooker is very useful for people who go out all day
    慢炖锅对于整天都不在家的人来说很有用。
20. Hypnotherapy can be useful in helping you give up smoking
    催眠疗法可能有助于你戒烟。
21. The police gained a great deal of useful information about the organization.
    警方收集到了大量关于该组织的有用信息。
22. The accommodation is some distance from the clubhouse, so a hire car comes in useful.
    住处离会所有一段距离，所以租一辆车会很有用。
23. All of our cultural heritage which is useful should be inherited, but in a critical way.
    凡属我国文化遗产中有用的东西，都应当批判地继承。
24. It has many omissions; even so, it is quite a useful reference book.
    那本书有许多遗漏之处，即使如此，尚不失为一本有用的参考书。
25. The canal has proved useful to the county in many ways.
    这条水渠给这个县带来的好处是多方面的。
26. This accident affords us a useful lesson.
    这个事故为我们提供了有益的教训。
27. I picked up some highly useful old books.
    我偶然得到了几本极为有用的旧书。
28. Year by year a few of these slang terms prove so useful that they graduate into respectable society.
    年复一年，这些俚语中的一些证明是十分有用的，因而逐渐进入了上流社会。
29. Do not idle about like this and do something useful.
    别再这样闲混下去了，做些有益的事吧！
30. This new dictionary is very useful [ helpful] to me.
    对我来说这本新词典很顶事。

adj

1. having a useful function
   1. utilitarian steel tables

   Synonym:    utilitarian

2. being of use or service
   1. the girl felt motherly and useful
   2. a useful job
   3. a useful member of society

   Synonym:    utile