你这句话是用来说明"to let the cat oute of the bag”这个典故的，"让猫从包里出来".意思就是"说出秘密".完整版好像是：Long ago, when people sold things in big cloth bags , a woman asked a man for a pig. The man held up his cloth bag. There seemed to be a little pig in ite. The woman asked to see it. When the man opened the cloth bag, a big black cat ran out. Note a pig...
