(~s)
If a hospital, a police force, or a military force is on ~, they have been warned that there may be an emergency, so they can be ready to deal with it.
All the Plymouth hospitals are on ~...
N-VAR
(~s)
If a hospital, a police force, or a military force is on ~, they have been warned that there may be an emergency, so they can be ready to deal with it.
All the Plymouth hospitals are on ~...
N-VAR
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012