(~s)
The ~s or ~ blades of a helicopter are the four long, flat, thin pieces of metal on top of it which go round and lift it off the ground.
N-COUNT
(~s)
The ~s or ~ blades of a helicopter are the four long, flat, thin pieces of metal on top of it which go round and lift it off the ground.
N-COUNT
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012