(~s)
You can use ~ to refer to one of the causes of an event or situation, especially if that event or situation is an unpleasant one.
Old buses are major ~s to pollution in British cities...
N-COUNT: oft N to n
see also contribute
(~s)
You can use ~ to refer to one of the causes of an event or situation, especially if that event or situation is an unpleasant one.
Old buses are major ~s to pollution in British cities...
N-COUNT: oft N to n
see also contribute
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012