Argon is an inert gas which exists in very small amounts in the atmosphere. It is used in electric lights.
N-UNCOUNT
Argon is an inert gas which exists in very small amounts in the atmosphere. It is used in electric lights.
N-UNCOUNT
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012