You are welcome. It is common that we are busy so that we can not return each other's email quickly. But it is no problem. I think our communication is a happy thing rather than a burden. So please return my email in your free time. And I will do the same.I think working hard is right. We should work hard to learn more knowledge. And in this way, we are more likely to get a good job. And you can make yourself, your family, your country, even the world better in this way.Come on!