a sad dog
讲解：Sad 表示“遭透的，坏透的”，dog 表示“家伙”，a sad dog 指“粗野，无理的人”。
英语情景对话：
A:What do you think of his behavior yesterday?
你怎么看他昨天的行为？
B: He’s a sad dog. He came to the wedding in jeans.
他是个粗野的人，竟穿牛仔裤参加婚礼。
A: I don't think so. He only had no common sense.
我不这么想，他只是没有常识。
英语学习笔记：
a sad dog
Eg.You're a sad dog. You spoiled everything.
你真鲁莽，把一切都搞砸了。
Eg.He was pleased that she should think he had been a sad dog.
他很高兴，她竟认为他曾经是个寻花问柳的人。
