a particular market or an area of business （某一）市场，商业领域◆The wholesale market is a highly competitive arena. 批发市场是高度竞争的领域。
an area of activity that concerns the public, especially one where there is a lot of opposition between different groups or countries 对立场所；竞争舞台◆The company's problems are now in the public arena(= are known and discussed by people in general). 公司的问题现已众所周知。