The bitterest creature under heaven is the wife who discovers that her husband's bravery is only bravado.
一个国家的真正财富来自于它的土壤。
The best way to understand labor markets is to look at real-world data, not just theoretical models.
理解劳动力市场的最佳方式是观察现实数据，而不仅仅是理论模型。