Red wine leaves a stain.

红葡萄酒会留下污渍。

《牛津词典》

I examine a stain on the tile ceiling.

我研究着空心天花板上的一个污点。

youdao

There is still a stain on the shirt.

衬衣上还有个污点呢？

youdao

But when she turned pale, there was the mark, like a red stain upon snow.

VOA: special.2009.09.26

But he says the abuses continue and that is a major blot (stain) on the new government.

VOA: standard.2009.06.21

The emotionality of the Slows had the strange characteristic of clinging to me like a stain.

NEWYORKER: The Slows

Probably as a period that carried a bit of a stain on the game, but little more.

FORBES: Ken Burns Looks at Baseball's Steroid Era

This gets stuck on the cell's surface and then reacts with a stain that is added to the sample.

ECONOMIST: Connectomics aims to map the atlas of the brain