行为的科学研究必须基于客观、可测量的数据。
The scientific study of behavior must be based on objective, measurable data.
The market is always changing, the only constant is change itself.
解释:依据自己的能力去做事,把握最佳时机采取行动。
"Books are the quietest and most constant of friends; they are the most accessible and wisest of counselors."