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

If we look forward to the end of the term when we read The Human Stain, which is about a man, Coleman Silk, who tries to and succeeds in passing as Jewish.

展望一下期末，那时我们会读到《人性的污点》,写一个叫Coleman，Silk的人他尝试，并成功地以犹太人身份在社会生活。

耶鲁公开课 - 1945年后的美国小说课程节选

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

VOA: standard.2009.06.21

For some Australians, the monarchy's continuing involvement in politics is a stain on their national pride.

WSJ: Australia Lawmakers Seek Split From U.K. Monarchy

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

NEWYORKER: The Slows

But it would certainly be a stain on what is already a rather mixed legacy.

BBC: Why Vaclav Klaus divides Czechs