可持续性不仅仅是植树,而是在正确的地方种植正确的树木,并确保它们世代繁茂。
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.
相关系数的可能误差不是一个固定的量,而是取决于样本的大小。
The difference between an ordeal and an adventure is your attitude.