Cashflow and the Error term

Cashflow is just like electricity, 现金流正如电流，平时觉得其存在都是理所应当的、不会断的，but it does, and when it does, your life suffers. 充电宝（power bank）只能维持很短一段时间，意义不大，也解决不了根本问题。负债更是饮鸩止渴，负债创造了现金流变多的错觉，实际上在一切不变的情况下，负债是使得现金流变得更加少的。

The error term is just like the shit of the animal, if shit goes wet or turn funny colour's , then something's wrong. Only by examing the shit, would tell the researcher a lot of information, in fact, lots of animal specialists pay lots of attention on the shit of animals.