This is the 17288th most frequent Russian word.
сферу
The Russian word "сферу" translates to "sphere" or "field" (as in area of activity or domain).
The word "сферу" is used here to mean a specific domain or area, referring to a field of study or interest, which is applied accusatively as the direct object of the verb "изучаем".
Мы изучаем сферу науки и технологий.
We study the sphere of science and technology.
Here, "сферу" conveys a broader context of the domain or area related to entertainment, in the accusative case as the direct object of "посещают".
Гости города часто посещают известную сферу развлечений.
Visitors of the city often visit the famous sphere of entertainment.
This usage of "сферу" refers to a conceptual domain or aspect, here pointing towards international relations, again as the direct object in its accusative form after "учитывать".