Economics is the study of how societies use scarce resources to produce valuable goods and services and distribute them among different individuals. If we think about the definitions， we find two key ideas that run through all of economics:
经济学特别是宏观经济学中说的投资是耐用资本品如厂房设备的生产，而平常说的“投资”是指购买资产如股票，这和经济学中的投资不同，为了区分，这种投资被称为金融投资。
The pursuit of mathematical knowledge is a journey that never ends, filled with endless curiosity and wonder.
无序系统不仅仅是需要消除的噪音；它们包含着关于自然的深刻真理。
对待小人态度严厉，不困难，困难的是让自己不去憎恨厌恶他们；对待君子恭敬谦逊，不困难，困难的是让自己始终以礼相待他们。
We are all searching for something, even if we don't know what it is.