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sac

noun
/sæk/
/sæk/
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  1. a part inside the body of a person, an animal or a plant, that is like a bag in shape, has thin skin around it, and contains liquid or air(人、动植物体内的)囊,液囊,气囊
    Oxford Collocations DictionarySac is used after these nouns:
    • egg
    See full entry
    Word Originmid 18th cent. (as a term in biology): from French sac or Latin saccus ‘sack, bag’.

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