(~s)
In a race, an ~ is a series of obstacles that people have to go over or round in order to complete the race.
N-COUNT
(~s)
In a race, an ~ is a series of obstacles that people have to go over or round in order to complete the race.
N-COUNT
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012