lifesaver [ˈlaɪfˌsevɚ]

例句:

• The cervical smear test is a lifesaver.
  宫颈涂片检查能够帮上大忙。
  
• The new drug is a potential lifesaver.
  这种新药有可能成为一种救命药。
  
• He thought of the old man as his lifesaver.
  他把老人看作他的救命恩人。
  
• The defibrillator turned out to be a lifesaver.
  来自WSJ
• The Screensaver Lifesaver project recently completed research into potential treatments for anthrax and smallpox.
  来自BBC
• Mr Bousfield, who has worked outside the schools for five years, said it had been a "lifesaver".
  来自BBC