Because this topic is becoming one of the hottest topic in Chinese ask and answer platform “zhihu”. I realized some answers mentioned this website because one of the authors in paper answers some questions. The answers from the author of the paper enraged us，because his explainnation was ridiculous and full of prejudice. As a email unfriendly country, even though Chinese may have email address, it doesn’t mean we want to use it in normal life. Besides, as far as I know, most people work in recipotions do not even have a email from the work place. Another answer is about japan， it is even more ridiculous. China and japan share a similar culture, the authors exclude japan because they found people will give the wallet to police booth. In china we usually give the wallet to lost and found box. I do not see the difference between police office and the box at all. Those are the main questions Chinese want to ask, and we need a answer. Sorry for leaving so many similar comments below this topic, but we want a reasonable answer.