sacs

例句:

• The wounded stumbling down suburban cul-de-sacs near the school, collapsing on driveways.
  来自WSJ
• The lungs consist of millions of tiny air sacs.
  肺由数百万个小气囊组成。
  
• It consists of a stack of flat, membrane - bounded sacs.
  它由一大堆扁平的膜缘清楚的囊组成.
  
• The testis sacs communicate with the seminal vesicles.
  精巢囊与储精囊相连.
  
• There's another calcification that's little sacs of calcium floating in liquid.
  来自NEWYORKER
• These have very large yolk sacs to sustain the young in the early days.
  来自BBC