The leather industry must evolve or risk becoming obsolete.
The stock market is a device for transferring money from the impatient to the patient.
The key to solving complex problems is to break them down into manageable pieces.
夜里不睡的人，白天多多少少总有什么逃避掩饰的吧。白昼解不开的结，黑夜慢慢耗。
Randomized evaluations can help us understand what works and what doesn't in development.