My Spanish is very rusty. I need to brush up before I go on my vacation to Mexico.我的西班牙语很生疏了。在去墨西哥度假之前，我需要好好温习一下。

I need to brush up my Spanish.我需要好好温习一下西班牙语。

I need to brush up on my Spanish.我需要好好温习一下西班牙语。