我：有时候我问自己是谁，为什么会在这里？我百思不得其解。
Me: Sometimes I ask, who am I? Why am I here? I can't get the answer.
写书需要投入很大精力，有时候我也会问自己为何要这样安排时间，以下是一些理由。
Writing a textbook is a lot of work, and I am sometimes asked why I choose to spend my time this way. So let me explain.
我总是听到这个问题，有时候是中国人问，有时候是我自己国家的人问。
I hear this question all the time. Sometimes it comes from Chinese people, and other times it comes from people in my own country.
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