You use ~ to indicate what a question or piece of information is about. (FORMAL)
...various questions ~ pollution and the environment.
= about
PREP: oft n PREP n
You use ~ to indicate what a question or piece of information is about. (FORMAL)
...various questions ~ pollution and the environment.
= about
PREP: oft n PREP n
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012