你很清楚地了解什么是直线和什么是曲线吗? 请不要急於回答“是”。事实上,只有取得了科学的帮助才能了解这些……首先,所有数学上的线,在人的意识中,乃是抽象的东西。严格地格来,线这个字在数学上的意义,是没有宽、没有高的,只有一个度量——长。而所有在自然界中存在的东西,却具有三个度量:长、宽、高。但是却不能说,线是人类臆想出来的;我们的大脑原来只反映在自然界中存在的事物 Are you very clear about what is a straight line and what is a curve? Please do not rush to answer “yes”. In fact, only with the help of science can we understand this... First of all, all mathematical lines are abstract in human consciousness. Strictly speaking, the meaning of the word line in mathematics is not wide, nor high, but only a measure—long. And all things that exist in nature have three metrics: length, width, and height. But it cannot be said that the line is a fantasy of mankind; our brain originally only reflected things that existed in nature.