教师必须具有健康的体魄，农人的身手，科学的头脑，艺术的兴味，改革社会的精神。

作家必须是生命的窃贼。

Natural experiments are a powerful tool for understanding causal relationships in the real world.

Writing is a way to confront the past.

Running a business requires social responsibility. We must not only pursue economic benefits but also pay attention to food safety and environmental protection.