The most expensive cost in free-to-play games is players' trust—once overdrawn, it can never be bought back.
我们心理学的一般立场是经验性的:我们的科学不过是经验的事实。
孔子说:“颜回真贤德!一篮饭,一瓢水,在陋巷,人人都愁闷,他却乐在其中。颜回真贤德!