音标:[sæk] ; 柯林斯词典等级:1 级;
n. 囊, 液囊, (美)战略空军司令部
[医] 囊, 袋
n. a structure resembling a bag in an animal
词型变化:名词复数形式 : sacs
考试类型:[托福]
词性分布:
名词100%

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