The study "critical period" earlier than Konrad Zacharias Lorenz, an Austrian zoologist, Nobel Prize winners. However, his experiments were done with poultry. Later, the psychologist thanks to the suggestion of Lorenz, has discovered many "critical stage" in the formation of human behavior. Recent studies show itself, the key phase is concentrated in childhood. Example 2-5 years old is the key stages of the development of spoken language, age 4-7 is the key stage written language development. The researchers said, children 5 years old can listen to understand single words in 2100 -2500. This period is very good language learning. After 12 years beginners learning a foreign language is difficult to pronounce. Children in Hong Kong, Macao speak fluent English and Korean language by living in society and family using both languages. They become "bilingual children". Obviously, learning foreign languages in key stage is too easy for a child.
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