Kang Yuhua, graduated from the Department of Chinese, Nankai University in 1961. She taught Chinese as a foreign language for more than 40 years in Beijing Language and Culture University, and has co-compiled many Chinese textbooks such as Conversational Chinese, 400 Chinese Sentences, etc, many of which are for sale in abroad market. Lai Siping, graduated from the Department of Chinese, Capital Normal University in 1965. She taught Chinese as a foreign language in Beijing Language and Culture University, and has co-compiled many Chinese textbooks such as Basic Chinese Textbook, Practical Chinese Textbook, Speaking Chinese, etc.