arena
noun [ C ] uk/əˈriː.nə/ us/əˈriː.nə/
(PLACE)
（体育比赛或表演用的）场地，竞技场，剧场
a large, flat area surrounded by seats used for sports or entertainment
an Olympic/a sports arena 奥运会／运动会比赛场地
(ACTIVITY)
活动场所;斗争场所;竞争舞台
an activity that involves argument and discussion
After 30 years in the political arena, our local member of parliament is retiring next year. 我们当地选出的这位下议院议员已经在政治舞台上活跃了30年，明年他就要退休了。