请翻译一句话到英语：XX扩大多少倍，YY也扩大多少倍

the rate is proportional to the concerntration of the solution,the rate varies directly with the concentration of the solution.
if the concerntration was decreased to half of the original, the rate will also decrease to half of its original.

xx amplifies the same times as yy does.

concentration reduced to half of the original, rate would become one half of the original.

the rate follows the concentration to shrink to a half.

the rate is proportion to the concentration of the solution.
proportion 成比例

There is a positive relationship between the rate and concentration of the solution, and if the concentration reduces to one half, the rate will also reduce to one half.