(stimuli)
A ~ is something that encourages activity in people or things.
Interest rates could fall soon and be a ~ to the US economy...
N-VAR
(stimuli)
A ~ is something that encourages activity in people or things.
Interest rates could fall soon and be a ~ to the US economy...
N-VAR
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012