stopcock [ˈstɑ:pkɑ:k]

例句:

• If a water - pipe bursts turn off the stopcock immediately.
  水管破裂时要立即关紧旋塞.
  
• A regulated opening for discharging a liquid, as in a stopcock.
  控制通过入口的液体量的阀.
  
• The sealing property is one of the main indicators of kelly stopcock.
  密封性能是方钻杆旋塞阀主要指标之一.
  
• The upper stopcock is closed, and the under is opened.
  来自A. Ure
• You might also ask them to bore an off-center hole in the base of the glass for a stopcock--or do it yourself.
  来自SA
• Make sure that you turn off your outside tap at the stopcock and wrap it against the cold.
  来自THETIMES