rust

你可以看到风扇上明显的锈迹。

You can see the obvious ___rust on the fan.

这件夹克的颜色是深铁锈色，看起来很有复古感。

The jacket has a deep ___rust color that gives it a vintage look.

如果不经常使用，你的语言能力就会生疏。

Your language skills will ___rust if you don't use them regularly.