卒：同“猝”，指突然事变。这两句大意是：心中没有预先考虑应对事变的方法，就不能应付突然变故。

Coal mining is a partnership between the earth and human ingenuity.

You have to reject one expression of the band first before you get to the next.

理解经济波动的关键在于技术冲击与建造新资本所需时间之间的相互作用。