定义就是限制。
The study of nature is a perpetual joy.
一个好故事的力量在于它能将你带到另一个地方,另一个时间,让你感觉自己是一个更大事物的一部分。
The improvement of the productive powers of labor, and the greater part of the skill, dexterity, and judgement with which it is anywhere directed or applied, seem to have been the effects of division of labor.