The 20,000 to 30,000 mentioned upstairs is too expensive ~ we poor children don't have that much money. I spent my summer vacation in Qingdao St. John's Language School _ Baidu Encyclopedia/Item/%e9% 9d% 92% E5% B2% 9b% E5% 9c% A3% E7% BA% A6% E7% BF% B0% EF% BC% 88% E6% BE% B3% E6. Aladdin learned it in this school. It only took a few thousand dollars to learn. Not so exaggerated ~