The subject matter is autobiographical, it's all to do with hope and memory and sensuality and involvement, really.

煤炭使美国在世界范围内保持竞争力。

The process of scientific discovery is as important as the discovery itself, for it teaches us about the nature of inquiry and the limits of our understanding.

宇宙不仅比我们想象的更奇怪，它比我们能够想象的还要奇怪。