Over 25 years of sampling insects, Brakefield and his colleagues noticed a change.
在超过25年的昆虫采样调查中， Brakefield和他的同事注意到一些变化。
2
Brakefield says the two-spot ladybugs are now so extraordinarily difficult to find that he can't continue the study.
Brakefield说现在双斑瓢虫如此稀有以至于他无法继续他的研究。
3
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.