Carbon dioxide is a gas. It is produced by animals and people breathing out, and by chemical reactions.
N-UNCOUNT
Carbon dioxide is a gas. It is produced by animals and people breathing out, and by chemical reactions.
N-UNCOUNT
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012