(~s)
A ~ is a small part of an animal’s body, shaped like a little bag. It contains air, liquid, or some other substance.
The lungs consist of millions of tiny air ~s.
N-COUNT
(~s)
A ~ is a small part of an animal’s body, shaped like a little bag. It contains air, liquid, or some other substance.
The lungs consist of millions of tiny air ~s.
N-COUNT
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012