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 毫无机会;
the dog days of summer 三伏天;
dog-tired 筋疲力尽
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Study in Class and out of Class
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