You may have the worst of your worries when you most appear to be at ease.
弦理论是二十一世纪物理学的一部分,偶然落入了二十世纪。
The life of the law has not been logic; it has been experience.
宇宙是一个巨大的地方,也许是最大的。
The development of the industry requires the joint promotion of policies, technology, and the market.