Telephony is a system of sending voice signals using electronic equipment.
These optical fibres may be used for new sorts of ~.
N-UNCOUNT
Telephony is a system of sending voice signals using electronic equipment.
These optical fibres may be used for new sorts of ~.
N-UNCOUNT
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012