Why people could not learn Oral English well I learned it from a Japanese paper. The writer analyzed the voice frequency of Japanese, Frech, UK English, US English, Russian, Spanish etc. English frequency is above 2000HZ. On the other hand, Japanese, French, Spanish is below 2000HZ. Russian is lucky, the frequency is from 125 to more than 4000. Above is the psyological analysis. The babies could hear the sound from 16HZ to 16,000HZ in spite of their nation. The situation will change when they are 6 years old bacause when 6 the ears are accustomed to the sound which they always heard. We could image the difference of people who always live in CHINA, Russia and U.S. after 6 years old. It is too fast for Chinese if he talks with a U.S. citizen as same as the U.S. people. But Russia, fortunately, they could relatively hear what the foreign people talking about clearly although he probably dont know the meanings of foreign language.