A law of nature, lex naturalis, is a precept or general rule found out by reason, by which a man is forbidden to do that which is destructive of his life or takes away the means of preserving the same.
文化适应不是一个被动的过程,而是一个主动的过程,涉及技术和社会的创新。
可持续发展不仅仅是一种趋势,更是我们对后代的责任。