At fairly regular intervals; fairly often; repeatedly.
Довольно регулярно; довольно часто; время от времени; иногда.
Every so often my brother and I get together for a camping trip.
It was hot work, but every so often Susan would bring us something cold to drink.
John comes to visit me every now and then.
When I am tired of sitting, every so often I stand up and walk about the room.