我们都对边疆的概念着迷，但这个边疆在不断后退。
We are all obsessed with the idea of the frontier, but it's a frontier that keeps receding.
The greatest journeys are those that take us back to ourselves.
我们衡量成功的标准不仅是产量多少，还有生态系统的改善程度。
语言是人类思维最强大的工具。