释义：君子在面对挫折、困难的时候，应该反躬自问，修养品德。蹇（jiǎn），多指行动迟缓、困苦、不顺利的意思。
用户思维比流量思维更重要。
The best way to solve a problem is to find a way to make it irrelevant.
The study of L-functions is a journey into the hidden patterns of numbers.
Leaders should have a strategic vision and a broad worldview to address complex international challenges.
思维法则的有效性不依赖于它们所应用对象的性质。
The mystery of love is greater than the mystery of death.