centre around/on something
phrasal verb with centre verb [ T ] UK (US center) uk/ˈsen.tər/ us/ˈsen.t̬ɚ/
（话题或兴趣）以…为中心，围绕着
to have something as the main subject of discussion or interest
The discussion centred around reducing waste. 讨论围绕着减少浪费而展开。