useful [ˈjusfəl]

例句:

• In business a poker face can be very useful.
  生意场上，不动声色会非常有用。
  
• "For heaven's sake!" Dot expostulated. "They're cheap and they're useful."
  “拜托！”多特反驳道，“它们又便宜又管用。”
  
• 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。
  
• So send your broken down PC to somewhere useful.
  来自BBC
• This technique is particularly useful in treating bladder cancer.
  来自BBC
• It is really useful and a very good idea!
  来自BBC
• She's a useful person to know.
  她是个应该结交的有用的人。
  来自《权威词典》
• The England cricket team scored quite a useful total.
  英格兰板球队得分总数令人满意。
  来自《权威词典》
• Horses are useful animals.
  马是有用的动物。
  来自《权威词典》