a person who supports an idea or belief or performs an activity

Adam Smith was an exponent of free trade. 亚当‧斯密提倡自由贸易。

Jacqueline du Pré was a leading exponent of the cello. 杰奎琳•杜普雷是一流的大提琴演奏大师。

a number or sign that shows how many times another number is to be multiplied by itself

In 64 and yn, 4 and n are the exponents. 在64和yn中，4和n是指数。