什么是 rat?Any of various long-tailed rodents resembling mice but larger, especially one of the genus Rattus.Any of various animals similar to one of these long-tailed rodents.Slang A despicable person, especially one who betrays or informs upon associates.Slang A scab laborer.A pad of material, typically hair, worn as part of a woman's coiffure to puff out her own hair.To hunt for or catch rats, especially with the aid of dogs.Slang To betray one's associates by giving information: ratted on his best friend to the police. Slang To work as a scab laborer.To puff out (the hair) with or as if with a pad of material.