I have to say that it's hard to learn Linux as a foreigner.
In mainland china,some ugly men translates the original English documents to chinese as main part of their books which saled at a high price of 80￥-120￥.
I can't accept this and find a on-line book,in Taiwan China,which written by VBird.
Finally,I decided to learn the English Language books.
But 2 month has pasted,I trained my English Pronounce best enough to my opinion at last.