市场是一个复杂的系统，我们试图用模型来简化它。

A 1% improvement in efficiency could mean the difference between life and death.

"Men and women differ in their desires for short-term mating because the reproductive benefits and costs differed for our ancestors."

解释：治理河道，要用疏导的办法使其通畅；治理百姓，要引导百姓使其敢言。

Small-scale fishermen are not relics of the past—they're pioneers of the future.

我感恩每一刻。

恐惧是唯一无法治愈的疾病。