axiom

In Euclidean geometry, a fundamental axiom is that a straight line can be drawn between any two points.

(Chinese) 在欧几里得几何中，一个基本的公理是任何两点之间都可以画一条直线。

The economic theory is built upon the axiom that individuals always act to maximize their own utility.

(Chinese) 这一经济理论建立在“个人总是为了实现自身效用最大化而行动”这一公理之上。