cattle grub

cattle-grub的词性：
n.（名词）

1. The larva of a warble fly, especially of the genus Hypoderma, that parasitizes cattle and causes a boillike swelling under the hide.
牛蝇的幼虫：牛蝇的幼虫，尤指皮蝇属 ，寄生在牛身上并会导致皮肤下的疖状脓肿