If you describe something as a ~, you are emphasizing that it helps you very much.
Pharmacists are a ~ when you don’t feel sick enough to call the doctor.
N-SING: a N emphasis
If you describe something as a ~, you are emphasizing that it helps you very much.
Pharmacists are a ~ when you don’t feel sick enough to call the doctor.
N-SING: a N emphasis
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012