(bones of contention)
If a particular matter or issue is a ~, it is the subject of a disagreement or argument.
The main ~ is the temperature level of the air-conditioners.
N-COUNT
(bones of contention)
If a particular matter or issue is a ~, it is the subject of a disagreement or argument.
The main ~ is the temperature level of the air-conditioners.
N-COUNT
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012