exponent

在5的4次方中，4是指数。

In 5 to the power of 4, the number 4 is the ___exponent.

在表达式5的4次方中，4是指数。

In the expression 5 to the 4th power, 4 is the ___exponent.

作为现代艺术的杰出代表，她举办了许多创新展览。

As a leading ___exponent of modern art, she has organized many innovative exhibitions.