Hi @liusir, it is really nice that you decided to try yourself and managed to do the first ever post for Steemit Engagement challenge. The topic of the Steem for Bangladesh community is really vast and in my opinion anyone can write something from their own experience and also we can learn different cultures and different technological condition in different part of the world.

While reading through your post, there are couple of areas that I like:

如果你可以问一位著名科学家一个问题，你会问谁，你会问什么？

如果我可以问一位著名科学家一个问题我会选择牛顿，我会问他：您的一生有几千种发明， 您在研发的过程中一定会有很多的挫折和失望，您是如何克服这些的。
因为我现在的社会，成功并不是最难的，最难的应该是在走向成功的过程中会遇到很多的坎坷，如何一直保持一个积极的心态才是最重要的。

(Google translator)

If you could ask a famous scientist one question, who would it be and what would it be?

If I could ask a famous scientist a question, I would choose Newton. I would ask him: You have thousands of inventions in your life. You must have a lot of setbacks and disappointments during the research and development process. How did you overcome these? .
Because in my current society, success is not the most difficult thing. The most difficult thing is that you will encounter many ups and downs in the process of success. How to always maintain a positive attitude is the most important.

Often we see only surface, we see final results and think that the person had it from the first time and get frustrated when we face some failure but if we dig into the depth, we see that those guys also had tough time and maybe on some occasion also thought to quit it but then took another attempt. That is the most difficult part of our live, to work hard to get to our goal.

I also was pleased to know that there is such services like:

1. Quick payment using smartphone
2. sharing the transport, and
3. online shopping

I believe those technological progresses all due to developing Internet service and computer science that is a driving force nowadays.

Thank you for your post and hope to see you around :)