—— 请按键盘 空白键 开始游戏 ——

生产力的提高是社会进步的动力。
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.
Life in the state of nature is solitary, poor, nasty, brutish, and short.
心理学必须基于可观察的事实,而非推测。
我是一个美国黑人,我为我的种族感到骄傲。我为自己是谁感到骄傲。我有许多自豪和尊严。