I answered, "Chinese use language, yan [言], to express their sense of thanks and then respectfully bow their body, shen [身], slightly, cun [寸]. And so, they use these three characters for the word" to thank. "
我回答：「中國人用口表示感激的心意，還恭敬地鞠躬，十分謙卑，所以構成了這個字。」