letup ['letˌʌp]

例句:

• The surgeons have been working for twenty hous without letup.
  那些外科医师一连工作了二十小时没有停止.
  
• They pressed on without letup until they got to the top of the hill.
  他们一鼓作气爬上山顶.
  
• He jaws with no letup.
  他没完没了地讲.
  
• There is little prospect of a letup in fuel shortages for the next few years.
  来自Nature