动物的表达：

1.chicken out胆小退缩 2.chicken胆小鬼 3.pig out大吃大喝 4.When pigs fly!永远不可能 5.rat me out出卖我 6.rat叛徒 7.dog-tired累得跟狗一样 8.doggy bag打包袋 9.horn-dog色狼 10.let the cat out of the bag不小心泄漏秘密 ；black sheep 害群之马；shaggy-dog story 无主题且冗长无聊的笑话故事；dog sleep 不时惊醒的睡眠；Every dog has its day 风水轮流转、人人皆有得意日； quiet as a mouse意思是一声不响、非常安静；kill two birds with one stone一石二鸟