永远不要低估人类精神的力量。它可以克服最不可能的困难。
Never underestimate the power of the human spirit. It can overcome the most impossible odds.
The state is the most important institution in human society because it is the only one that can legitimately use force to maintain order.
美国以其广阔的能力，能够在其境内容纳地球上所有的人口。
"阿拉伯小说正在经历它最辉煌也最痛苦的时期。"
科学中的每一个发现都会引发一系列新的问题，这正是它如此令人兴奋的原因。
Science is not just about discovering new things, but also about improving the quality of life for people around the world.