在全球化时代，保持文化身份比任何时候都更重要。

【译文】 孔子说：“天冷时，才知道松柏最后凋谢。”

Every body continues in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed upon it.

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