“柠檬问题”指的是当卖家比买家掌握更多信息时，评估产品质量的困难。

在计算学习领域，关键不仅在于学习，而在于高效地学习。

Efficiency is the first virtue of engineers.

Suffering! We owe to it all that is good in us, all that gives value to life; we owe to it pity, we owe to it courage, we owe to it all the virtues.

词语的美在于它们能够唤起无法言喻的东西。