膨胀的概念表明，宇宙在大爆炸后不久经历了一段极其快速的扩张期。
The concept of inflation suggests that the universe underwent a period of extremely rapid expansion shortly after the Big Bang.
Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful.
愉快是健康的最佳促进者，对心灵和身体同样友好。
The end of history will be a very sad time. The struggle for recognition, the willingness to risk one's life for a purely abstract goal, the worldwide ideological struggle that called forth daring, courage, imagination, and idealism, will be replaced by economic calculation, the endless solving of technical problems, environmental concerns, and the satisfaction of sophisticated consumer demands.