几千年来人类一直很难对付环境,许多问题涉及到食物的获得、窃贼的威胁,居住的地方以及人类操纵其环境的限度等等。有些情形千差万别,有些则又惊人相似,但无论怎样,只要人类观察得越多,他看到的事物也就越多。经过一段时间和磨难之后,人类发明出一种综合分类的方法——人类学会了算数。 For thousands of years, mankind has been having a hard time dealing with the environment. Many problems have involved the access to food, the thieves’ threats, the places where they live, and the limits on which mankind can manipulate their environment. Some situations vary widely, while others are strikingly similar, but in any case, the more humans observe, the more things they see. After a period of time and tribulation, mankind invented an integrated method of classification - humankind learned arithmetic.