雅思口语天天练：关于狗狗的谚语　　a cat-and-dog life 争争吵吵的日子; 　　go to the dogs 每况愈下; 　　lead a dogs life 贫困潦倒; 　　hang-dog look 垂头丧气，愁眉苦脸; 　　not have a dogs chance 毫无遥; 　　the dog days of summer 三伏天; 　　dog-tired 筋疲力尽