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

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。