基础设施决定论原则认为，生产和再生产的客观行为模式概率性地决定了家庭和政治经济的客观行为，进而概率性地决定了行为和思想的上层建筑。

You know, in the Middle Ages, in England, when you met a very poor person, that person would be described as an "unfortunate" -- literally, somebody who had not been blessed by fortune, an unfortunate.

The key to successful investing is to have a clear strategy.

The best way to learn is by doing, not just by listening or reading.

解析：意在言外，得意忘言。