释义：A low and sneaky person. （卑鄙的小人）
例句：Your agent seems like a dirty dog, so I wouldn't sign any contract he gives you.
That dirty dog tried to get fresh with me!
Professor Moriarty could be described as the dirty dog of the Sherlock Holmes stories.
2. 表述：lead a dog life
释义：江苏快三计划To lead a life that is difficult, unpleasant, or boring. （过着困难，不愉快和无聊的生活了，过着牛马不如的生活，过着悲惨的生活）
例句：My poor dad lived a dog's life to provide for his kids, but we just wrote him off as a boring nobody.
I've had to lead a dog's life since college just to make ends meet.
I've been working so hard. I'm tired of living a dog's life.
3. 表述：be as sick as a dog
释义： To be very ill. （病得很严重）
例句：Honestly, I haven't been avoiding you—I've been sick as a dog.
I had to go to the doctor on Monday because I was as sick as a dog all weekend.