There's a dirty mark on the map so I can't see what the place is called.

地图上有一个脏的标记，所以我看不到这个地方叫什么。

His feet left dirty marks all over the floor.

【mark】他的脚踩得地板上到处都是污迹。

A " stain" (stain) is a dirty mark – a dirty section of your clothing, or a sheet, or a towel; it could be on a rug, any kind of fabric.

“污渍” （stain）是脏污的标记——你的衣服、床单或毛巾的脏污部分；它可以在地毯上， 任何一种织物上。