The goal is not perfection but progress.

过去是一个异国他乡；他们做事的方式不同。

勇敢者的心永远不会被奴役。

非暴力是人类可以使用的最强大力量。

The application scenarios of drones far exceed our imagination.

In our reasonings concerning matter of fact， there are all imaginable degrees of assurance， from the highest certainty to the lowest species of moral evidence.

Sustainability is not just a goal, it's a responsibility.