当最后一棵树被砍倒，最后一美元将失去意义。
When the last tree is cut, the last dollar will lose its meaning.
写作是为沉默者发声。
Drones in the future will be as ubiquitous as smartphones are today.
如果一个聪明人干了一件蠢事，那就不会是一件小小的蠢事。