worthless [ˈwɜ:rθləs]

例句:

• Training is worthless unless there is proof that it works.
  除非能证明训练有效，否则就是白搭。
  来自柯林斯例句
• If you are starving, a computer is worthless.
  来自SA
• You feel you really are completely worthless and unlovable.
  你会觉得自己真是毫无价值，一点也不讨人喜欢。
  
• The guarantee could be worthless if the firm goes out of business.
  如果厂家倒闭，保修单就会变得毫无用处。
  
• These financial products turned out to be virtually worthless.
  来自BBC
• Humanitarian aid made at a right time is worthless.
  来自BBC
• He is a worthless fellow who lives by gambling.
  他是个靠赌博为生的窝囊废。
  来自《权威词典》
• Don't read worthless books.
  不要读些没有用的书。
  来自《权威词典》