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。

Loneliness is the human condition, and no amount of technology can change that.

你让我明白，我有理由爱自己。

With a library you are free, not confined by temporary political climates. It is the most democratic of institutions because no one - but no one at all - can tell you what to read and when and how.

获得幸福的唯一方法是去爱。爱得热烈，痛苦就会很快过去。