The natural effort of every individual to better his own condition， when suffered to exert itself with freedom and security， is so powerful a principle that it is alone， and without any assistance， not only capable of carrying on the society to wealth and prosperity but of surmounting a hundred impertinent obstructions with which the folly of human laws too often encumbers its operations.
每个个体改善自身状况的自然努力，当在自由和安全的情况下得以发挥时，是如此强大，以至于它不仅能够独自，不受任何协助，推动社会走向富裕和繁荣，而且能够克服往往由愚蠢的人类法律造成的百般妨碍。
The concept of legal validity is crucial for understanding the nature of law.
The only thing that you absolutely have to know is the location of the library.
The best works are those that refuse to be easily understood.
采矿领域的领导力意味着今天做出艰难的决定，为了更美好的明天。
The city is a living organism that constantly evolves.