绿色螺旋线由内部每一个正方形和四分之一圆相切线构成，而红色的螺旋线是黄金螺旋线，它是对数螺旋线的一种特殊类型。

The green spiral is made from quarter-circles tangent to the interior of each square, while the red spiral is a Golden spiral, a special type of logarithmic spiral.

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乔伊斯的车停在停车场的访客区，是那个四分之一圆圈中的最后一辆车。

Joyce's car was the last one left in its quadrant of the visitor lot.

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我们已经做过的一个例子是，计算四分之一单位圆上的二重积分。

One example that we did, in particular, was to compute the double integral of a quarter of a unit disk.

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During this part, when you're doing a quarter of a circle, this is supposed to be a quarter of a circle.

在这部分,当你沿着四分之一圆运动,这就是个一个圆的四分之一

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So that a half circle, instead of calling it 180 degrees, And a quarter circle, instead of 90, It's good to know certain famous angles.

半圆,不说它是180°,四分之一圆,不叫90°,知道一些常用的角度很有必要

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