setigerous sac

例句：

1. 1. The spider's web is suspended in the air by a setigerous sac.
   蜘蛛网通过一个刺毛囊悬挂在空中。
2. 2. The scientist discovered a new species of beetle with a setigerous sac on its leg.
   科学家发现了一种新种类的甲虫，它的腿上有刺毛囊。
3. 3.The cysts are filled with a clear fluid that can be seen through a setigerous sac.
   这些囊泡内充满了清澈的液体，可以通过刺毛囊观察到。