李唐，

you helped me a lot. you know what, when i finished the essay this morning, i did not feel like it. some sentences were sloppy. the logic among some sentences was not very clear. but i just didn't know how to make it better:)
just now,when i read your version, i feel as if you knew something in my mind. you helped me a lot.
i'll read your version again:)

thanks so much.