The hardness of material is not in direct proportion to the wear resistance.

材料的硬度和耐磨性不成正比；

youdao

If your client's system clock is not almost exactly synchronized with your server's system clock, you will experience peculiar results in direct proportion to the size of the discrepancy between them.

如果您的客户机系统时钟不是完全与服务器系统时钟同步的话，您就会得到与两个时钟的时间差大小成正比的特殊结果。

youdao

The truth is that when crude prices drop and our fuel margins dwindle, our chemicals margins rise--not in direct proportion, mind you, but sufficiently to cushion the blow.

FORBES: Magazine Article