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Air brakes are brakes which are used on heavy vehicles such as buses and trains and which are operated by means of compressed air.
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(~s)
Air brakes are brakes which are used on heavy vehicles such as buses and trains and which are operated by means of compressed air.
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Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012