Ozone is a colourless gas which is a form of oxygen. There is a layer of ~ high above the earth’s surface.
What they find could provide clues to what might happen worldwide if ~ depletion continues.
N-UNCOUNT: oft N n
Ozone is a colourless gas which is a form of oxygen. There is a layer of ~ high above the earth’s surface.
What they find could provide clues to what might happen worldwide if ~ depletion continues.
N-UNCOUNT: oft N n
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012