Happiness is rarely absent; it is we that know not of its presence.
幸福很少缺席；是我们不知道它的存在。
每一代人都需要一场新的革命。
The most important political distinction among countries concerns not their form of government but their degree of government.
狗是人类的朋友，因为它看人不分贵贱。
自主创新不是闭门造车，而是在开放合作中掌握核心技术。