work like a dog 苦干，拼命工作，努力工作

【例句】
They say that to be successful, a person has to work like a dog.
他们说，一个人想要成功就得拼命工作。

I work like a dog all week and the taxman takes most of my pay before I even see it.
我拼命工作了整整一个星期，而结果甚至在我没看到薪金前税务员就拿走了其中的大部分。