It illustrates a ellipse's short semi-axial curved line with great cured radius, that can replace the straight line for cutting squarework-pieces on the machine tool.
车方机床用曲率半径很大的椭圆短半轴曲线代替直线切削方形工件。
2
A new metro runs under the square, carrying hundreds of thousands who used to cycle to work.
一条新地铁在广场下面运行，载着数以千计过去骑自行车上班的人们。
《柯林斯英汉双解大词典》
3
As we've seen previously, he argued that the complexity and communication costs of a project rise with the square of the number of developers, while work done only rises linearly.