要学会控制投资风险，使用适当的风险管理工具。
要理解递归，首先必须理解递归。
We must learn from the past to innovate for the future.
The history of philosophy is not, like the history of the sciences, to be considered as a mere chronological record of discoveries and errors. It is the history of the human spirit in its endeavor to understand itself and its relation to the universe.
The artist must be a philosopher, a poet, and above all, a revolutionary.