(~s)
A ~ is a problem which stops you from achieving something.
Perhaps the major ~ to reunification is the military presence in South Korea.
N-COUNT: oft N to/in n
(~s)
A ~ is a problem which stops you from achieving something.
Perhaps the major ~ to reunification is the military presence in South Korea.
N-COUNT: oft N to/in n
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012