SAC

英文解釋：

名詞 sac:

1. an enclosed space
   同義詞：pouch, sack, pocket
2. a case or sheath especially a pollen sac or moss capsule
   同義詞：theca
3. a member of the Algonquian people formerly living in Wisconsin in the Fox River valley and on the shores of Green Bay
   同義詞：Sauk
4. a structure resembling a bag in an animal

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中英例句：

1. A fluid-containing sac or cavity in the body of an organism.
   池有機體體內一種貯存流體的液囊或穴
2. An air-filled sac or structure that aids in the flotation of an aquatic organism.
   氣囊水生動植物器官中用來幫助飄浮用的充滿氣體的囊或結構
3. An organic sac or pouch, such as the udder of a cow.
   (牛的)乳房有機體器官的液囊或袋，如牛的乳房