( hard hats)
A hard hat is a hat made from a hard material, which people wear to protect their heads on building sites or in factories, or when riding a horse.
N-COUNT
( hard hats)
A hard hat is a hat made from a hard material, which people wear to protect their heads on building sites or in factories, or when riding a horse.
N-COUNT
Collins COBUILD Advanced Learner's English Dictionary. Английский словарь Коллинз COBUILD для изучающих язык на продвинутом уровне. 2006