Some historians speculate that Ancient Egyptian surveyors used one such set of numbers, 3, 4, 5, to make square corners.

一些历史学家推测，古埃及的测量人员使用了这样一组数字，3、4、5 来制作方形的角。

According to the converse of the Pythagorean theorem, that has to make a right triangle, and, therefore, a square corner.

根据毕达哥拉斯的逆定理，这就可以形成一个直角三角形，因此，便可形成直角。

The building was originally designed with square corners, but when a scale model was tested in a wind tunnel, the designers saw a lot of swaying.

这座建筑原本是设计成四角的，但当一个比例模型在风洞中测试时，设计师们看到了大量的摇摆。