(~s)
A ~ is a helmet that motorcyclists wear in order to protect their heads if they have an accident.
N-COUNT
(~s)
A ~ is a helmet that motorcyclists wear in order to protect their heads if they have an accident.
N-COUNT
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012