随机实验是因果推理的黄金标准，但它们并不总是可行的。

Success is not final, failure is not fatal: It is the courage to continue that counts.

Joy is the emotion which accompanies the fulfillment of our natures when we have lived up to our potential.

The most sustainable product is the one that already exists.

Never underestimate the power of collaboration—great things are rarely achieved alone.

出自汉·桓宽《盐铁论·地广》。贱，指地位低。贫，指没有钱财。地位卑贱并不妨碍一个人的智慧，家境贫寒并不妨碍一个人的品行。这句话言评价一个人的才智、德行不能根据其社会地位、经济状况来作判断。出身低贱的人，不一定没有智慧；家境贫寒的人，不一定没有品行。

Greatness comes from believing in yourself and never giving up.

凡是创作古文，必须推究前代文章的本意，以此展现自己的学问。