Business cycles are not, as once thought, merely fluctuations around a stable trend, but rather reflect deeper structural changes in the economy.
经济周期并不像曾经认为的那样仅仅是围绕稳定趋势的波动，而是反映了经济中更深层次的结构性变化。
The only real mistake is the one from which we learn nothing.
A company that does not innovate is a company that does not grow.
Strive for excellence, not mediocrity.
学习数学的唯一方法就是做数学。
对知识的追求是无止境的，而这正是它令人兴奋的地方。
