In some ways, Brakefield says, the case is not unlike that of the famous peppered moths in Liverpool, which became darker as the trees in the area blackened with soot, protecting them from birds.

从某种程度上来说，Brakefield说道，这种情形就像是散落在利物著名的飞蛾，在这一块树木烧焦的地方变成深色，以使他们免受鸟类的袭击。

youdao

Now, with the clean air brought by anti-pollution legislation, British peppered moths are once again peppered.

ECONOMIST: Pollution and evolution