煤炭不仅仅是一种商品，它是对美国未来的承诺。

I often take exercise. Why only yesterday I had breakfast in bed.

Thought is the most difficult task, which is why so few engage in it.

教育是可持续林业实践生长的种子。

We die containing a richness of lovers and tribes, tastes we have swallowed, bodies we have plunged into and swum up as if rivers of wisdom, characters we have climbed into as if trees, fears we have hidden in as if caves.