We have many peer works in our ARW class, especially in e-writing portfolio. But why do we need peer reviews? We are not specialists about English and each of us has the similar ability. Yes, we are not teachers or proofreaders, but we can find classmates’ mistakes and give some good advices. Then I think peers are like mirrors which reflect my sentences. They notice me some points I didn’t realized. Also, while I am an ordinary student, I am gradually improving my reviewing skill and knowing my peers’ tendency in writing. Reading other student’s essay is indispensable to develop our own writing skills, like stopping in front of mirrors every morning!