Nettle 's team used data from the national child development study , an ongoing longitudinal study of all people born in the uk between 3 and 9 march 1958 .
But the butterflies are also benefiting from the mowing of roadsides , which allows more nettle plants to grow .
不过,这些蝴蝶也受惠于公路两旁出现的割草活动,因为更多的荨麻植物因此而得到了生长空间。
In his study , nettle focused on 4553 women in the cohort who had provided details of their first pregnancy and looked at four potentially disruptive factors in the first seven years of their childhood .