2. The source of Levin's "Mother and Child": "However, she has experienced countless storms and knows that her unavoidable troubles are only holding her head high."
3. Sincerity is a Chinese word, pronounced as chì chéng, which means loyalty, sincere heart and extremely sincere mind.
4. From "The Biography of Northern History Ai Zhu Rong": "Knowing the sincerity of foreigners means benefiting and Li Yu telling foreigners."