level area in the centre of an amphitheatre of a sports stadium or public entertainments, etc.
place or scene of activity or conflict
"his social sphere is limited"
"it was a closed area of employment"
"he's out of my orbit"
Howe seldom entered the arena of controversy.
出自： H. Rogers
Economic society was an arena in which men met to compete.
出自： J. K. Galbraith
A landscape without theatricals except when it became an arena for summer storms.
出自： N. Gordimer