exponent

/ˈɛkˌspoʊnənt/

a person who pleads for a cause or propounds an idea

中文释义：倡导者；拥护者；代表人物

She is a leading exponent of modern dance in the international community.

她是国际现代舞界的领军倡导者。

As an exponent of free trade, he argued against protectionist policies.

作为自由贸易的倡导者，他反对保护主义政策。