cat's-paw 受人利用者，工具人

I thought that Mary really loved me, but in the end, I was just a cat's-paw.

我还以为玛丽喜欢我，到头来我只是个工具人。

tool 工具

-A: I feel that you are just using me to do your English homework.I am just a tool for you?

我觉得你只是在利用我帮你做英语作业，所以我就是个工具人？

-B: You are right. I am sorry.

是的，对不起