Have you ever seen Huang Duoduo speak English with anyone except Feynman and Joe? Feynman's Mandarin is poor and he is introverted, so he only likes to play with Joe, and Joe doesn't like playing with mainland children very much. These two children can also speak English. Wu Zhenyu and Cao Ge can't educate their children in Mandarin, can they? Wu Zhenyu is English+Cantonese, and Cao Ge is English+Taiwan Province Mandarin, so English is their best way of communication. Sister Baozi is too young to speak English very well, but she can only sing English songs. Among other children, only Duoduo English is the best, and only Duoduo knows that others feel the best. So what's wrong with communicating with Feynman and Joe in English that is more acceptable to them? Bell and Grace, who are also good playmates, have been speaking Mandarin to them from beginning to end, including others. Language is born for better communication. Why should it be given special meaning? You see, Wu Zhenyu and Feynman can only speak English and Cantonese when they are alone. As long as there are outsiders or other children, Wu Zhenyu speaks his poor Mandarin with his children. This is respect, okay? Duoduo is just an 8-year-old child. He may not think so much, but he thinks it is better to communicate in different languages that people can't speak, and people have this ability.