 
							 美 
											[ə'riːnə]
										
													美 
											[ə'riːnə]
																 
										
							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