柠檬问题是指买家无法确定产品质量，因此只愿意支付反映平均质量的价格。

If you are looking for something in your house， and you finally find it， when you’re done with it， don’t put it back where you found it. Put it back where you first looked for it.

成功投资的关键是尽量减少成本和税收。

恋爱是艰苦的，不能期待它象美梦一样出来。