量化宽松的问题在于它在实践中有效，但在理论上却行不通。
The problem with quantitative easing is that it works in practice but it doesn't work in theory.
The beauty of topological insulators lies in their robustness; their surface states are protected by symmetry and topology, making them immune to certain types of disorder.
"The greatest gift you can give someone is your time and attention."
数学研究是一次进入未知的旅程，每一次发现都为新的谜题打开了大门。
"The journey of a thousand miles begins with one step."
我相信最有力的电影是那些挑战观众认知的电影。
"The truth is rarely pure and never simple."
