Round the circumference with the back of a knife.

用刀背绕圆周敲击。

The ratio of the circumference of a circle to its diameter.

圆周长与其直径之比。

It's also the ratio of a circle's circumference divided by its diameter.

它也是圆周长除以直径的比率。

We need the circumference of the area.

我们需区域的圆周长。

It is used for the ratio of the circumference of a circle to its diameter.

pi代表着圆周到直径的比例。

He says Pi is particularly beautiful.

他认为圆周率特别美丽。

I could rattle off pi to 25 places.

圆周率能随便背 25 位数。

Happy Friday, Fri-yay, and Pi Day.

周快乐，圆周率日快乐。

The date March 14, as we write it in the United States, is 3-14.

而圆周率日正是由近似值3.14得。

Or that your magic mirror can turn pi into pi.

或者你的魔镜可以把圆周率变成 3.14。

" Spin" and " rotate" as verbs both involve circular movement.

作为动词的spin和rotate都涉及圆周运动。

The Equator is a great circle midway between the North and South Poles.

赤道圈是一位于南北极当中的大圆周。

An eddy is a large current of water moving in a circular motion.

涡流是指做圆周运动的大量水流。

Pi Day is not just for those who enjoy numbers.

圆周率日不仅是为热爱数字的人而设立的。

721. The recruit made the current circulate in the circuit on the circumference.

新兵使电流在圆周上的电路中循环（传播）。

Met! True art thou, lad, as the circumference to its centre.

握一握！孩子，你真像圆周对圆心一样忠诚。

A circle is a two dimensional figure with a radius and a circumference which is the distance around the circle.

圆是具有半径和圆周的二维图形，圆周是围绕圆的距离。

One pizza restaurant is celebrating Pi Day in a big way.

有一家披萨店用盛大的形式欢庆圆周率日。

Unique because it has a pattern of the mathematical symbol pi.

之所以说它特别是因为上面有圆周率π的数学符号。

How did you get interested in doing this a different way?

以不同方式记忆圆周率，你是如何对它产生兴的？