Subsonic speeds or aeroplanes are very fast but slower than the speed of sound.
This is 20,000 feet higher than most ~ airliners.
ADJ: ADJ n
Subsonic speeds or aeroplanes are very fast but slower than the speed of sound.
This is 20,000 feet higher than most ~ airliners.
ADJ: ADJ n
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012