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sac
sæk sæk
Word forms: plural sacs
N-COUNT (动物体内的)囊,液囊,气囊 A sac is a small part of an animal's body, shaped like a little bag. It contains air, liquid, or some other substance. (动物体内的)囊,液囊,气囊
  • The lungs consist of millions of tiny air sacs.

    肺由数百万个小气囊组成。

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Animal body parts: anatomical, anatomy, antler...
Parts of plants: aerial root, anther, beanstalk...

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