在化学中，就像在生活中一样，最具变革性的反应往往需要耐心和精确的条件。
可持续发展不仅仅是一种趋势，而是我们对后代的责任。
灵魂是旅行者，而身体是它的行李箱。
The value of a commodity, or the quantity of any other commodity for which it will exchange, depends on the relative quantity of labor which is necessary for its production, and not on the greater or less compensation which is paid for that labor.
The pursuit of power is the primary goal of states in the international system.