n.a person or thing having the same function or characteristics as another
同义词：counterpartvis-a-vis
英汉双解大词典
opposite numberstar1(oppositenumbers)
1.
N-COUNT（可数名词）
Your opposite number is a person who has the same job or rank as you, but works in a different department, firm, or organization. 职位相当的人; 地位相当的人 [英国英语] [journalism]