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I was sorry that there were not many big bookstores in Hong Kong.
We can find big bookstores in Japan or in Germany much easier than in Hong Kong.
The bookstore I found sold both English and Chinese books.
I bought German learning CDs and Chinese leaning CDs explained in English in a bookstore.
Cantonese learning CDs were also sold.
Though I wanted to buy one, I gave up because I found that I would not have much time to study it in my life.