Fluoridation is the action or process of adding fluoride to a water supply.
...~ of the water supply.
N-UNCOUNT
Fluoridation is the action or process of adding fluoride to a water supply.
...~ of the water supply.
N-UNCOUNT
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012