柠檬问题发生的原因是卖家比买家更了解产品，从而导致市场失灵。

"To write is to bear witness."

宜安静，少说话，从容不迫，严谨及俭约，这些都是监督自己的良言。避多欲，盲动，心不专一，以此避免自己的缺失。在实践这些修养的过程中，能体会到恒字的秘诀。而在不间断的过程里，能体验出渐字的秘诀。

气候变化和过度捕捞是我们必须共同应对的双重威胁。

Innovation is not the goal; solving problems is.

The concept of computational complexity is not just about how fast we can compute, but also about understanding the limits of what can be computed.

To write is to resist—to resist forgetting, to resist oppression, to resist the erasure of memory.