应对不自由世界的唯一方法是变得如此绝对自由，以至于你的存在本身就是一种反抗。
I believe in the discipline of mastering the best that other people have ever figured out.
The true challenge in mathematics is not solving problems, but asking the right questions.
广东话谚语
The best economic research is often interdisciplinary.
The beauty of topological insulators lies in their robustness; their surface states are protected against disorder and imperfections.