1. N-COUNT An arena is a place where sports, entertainments, and other public events take place. It has seats around it where people sit and watch. 競(jìng)技場(chǎng)

...the largest indoor sports arena in the world. …世界上最大的室內(nèi)躰育競(jìng)技場(chǎng)。

2. N-COUNT You can refer to a field of activity, especially one where there is a lot of conflict or action, as an arena of a particular kind. 鬭爭(zhēng)場(chǎng)所

He made it clear he had no intention of withdrawing from the political arena. 他明確表示他沒有退出政治舞臺(tái)的意圖。