Sorry, coz during those days i was in a very bad situation ( :( now i am ok)and the posts on Rolia were refreshed so fast to be ignored even after several hours!

Thank you for your reply! Actually i was joking to you about the word selection, seems you are good at not only technical but language. That is why i want to ask for your advice, how to express oneself with a fluent and pure English? Can you introduce some related new books to me?

I am here in Toronto for three months, my feeling is even my oral and listening comprehansion skills are improving day by day, i can not express myself freely with enough vocabulary, or idioms. I am always wondering how to overcome such obstacle.

If you have time, welcome to Toronto, and I would be very happy to meet you. Feel free to send email to me before that.

Thanks again! Have a good day!