Comment by shijie

> My English is not that bad.

I'd say it's quite good. However, I'd quit it with the space after the comma thing, and the no space after the period thing you're doing:

>But I'm sorry , i would like to correct some misunderstandings.

Should look like

But I'm sorry, I would like to correct some misunderstandings.

> And finally , please read the end of the post.I'm sure you will like it.

Should look like

And finally, please read the end of the post. I'm sure you will like it.

Great article though! Really enjoyed reading it.

Edit: formatting