exponent

1. N-COUNT An exponent of an idea, theory, or plan is a person who supports and explains it, and who tries to persuade other people that it is a good idea. 倡導者[正式]

...a leading exponent of test-tube baby techniques. …一位試管嬰兒技術的主要倡導者。

2. N-COUNT An exponent of a particular skill or activity is a person who is good at it. 擅長者; 典范

The Alvin Ailey American Dance Theatre was formed in the 1950s and quickly established itself as a leading exponent of progressive choreography and contemporary dance. 阿爾文·艾利美國舞蹈劇形成于20世紀50年代，并很快樹立自己為激進舞蹈藝術和現(xiàn)代舞蹈的最主要的典范。