Not only do we live in the world of thought， but also in the world of matter.
想要让人群或醉汉安静下来的话，只需要小点声说话就行。
When life seems hard, the courageous do not lie down and accept defeat; instead, they are all the more determined to struggle for better future.
煤炭的未来取决于我们能否使其更清洁、更高效。
The world is so full of people, so crowded with these miracles, that they become commonplace and we forget.
科学的进步是逐渐认识到我们面临的问题并不像它们看起来那么简单。