any large stout-bodied dipterous fly of the family Tabanidae, the females of which suck the blood of mammals, esp horses, cattle, and man 虻科 (Also called gadfly, cleg)
noun [专属名词]马蝇;虻
That horsefly is the only thing keeping this old horse moving. 那只马蝇是唯一能让这匹老马活动的东西。