An exponential rate of increase becomes quicker and quicker as the thing that increases becomes larger.

We are looking for exponential growth in our investment. 我们希望投资能够呈几何数增长。

There has been an exponential increase in the world population this century. 本世纪世界人口一直呈几何数增长。

containing an exponent (= a number or sign that shows how many times another number is to be multiplied by itself)

64 is an exponential expression. 64是一个指数式。