中间人 /zhōngjiānrén/ angolul

broker [brokers]▼(mediator between a buyer and seller)
noun
[UK: ˈbrəʊkə(r)] [US: ˈbroʊkə(r)]

go-between [go-betweens]▼(intermediary or middleman)
noun
[UK: ˈɡəʊ bɪ.twiːn] [US: ˈɡoʊ bɪ.twiːn]