There are many birches in a beautiful summer forestThere are many birches in a beautiful summer forest
Rejuvenating apples - aren't they the heroes of many fairy talesRejuvenating apples - aren't they the heroes of many fairy tales
A snow-covered path outside the city, which is used by many passers-by and carsA snow-covered path outside the city, which is used by many passers-by and cars
Значительные по количеству (о ряде однородных единиц, предметов). Нечто большое по количеству, содержанию.