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

它也是周长除以直径的比率。

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

pi代表着周到直径的比例。

We need the circumference of the area.

我们需要这个区域的周长。

Any intelligent species might have an interest in natural numbers (1, 2, 3 and so on) as well as things such as pi.

任何聪明的物种都可能对自然数(1、2、3等等)和周率之类的东西感兴趣。

Unlike an adventure round the circumference of the Earth.

不像沿着地球周进行的冒险。

In the simplest definition, pi is the ratio of a circle's circumference to its diameter.

在最简明的定义中，π是周长与其直径的比率。

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

新使电流在周上的电路中循环（传播）。

You see, the ratio of a circle's circumference to its diameter is what's known as an irrational number, one that can never be expressed as a ratio of two whole numbers.

因为，周长和直径的比值是一个无理数，它无法用两个整数的比值来表示。

A bulldozer is a powerful vehicle with a caterpillar track on it, so it means that the wheels act kind of in a long caterpillar-like tread, and those treads move in a long circular motion rather than just in a circular motion.

推土机是一种装有履带的强大车辆，这意味着其轮子作用类似于长条形的履带式履带，这些履带进行的是长周期的周运动， 而非简单的周运动。

You can choose anything that you want: a poem, the state capitals, the first 25 digits of PI.

一首诗、各州的首府周率的前25位。

That's right, March 14th, or 3.14, the day we celebrate the fascinating mathematical constant Pi, the ratio of a circle's circumference to its diameter.

没错，314日，也就是3.14，是我们庆祝迷人的数学常数周率的日子，这是的周长与直径的比值。

People had to learn to move their hips in a circular motion, like a hula dancer in Hawaii, to spin it around their body.

人们必须学会像夏威夷的草裙舞演员那样，以周运动的方式移动臀部，使这个大管绕着身体旋转。

Of all the oceans, the Pacific is by far the largest, stretching almost a third of the way round the globe.

在所有的大洋之中，太平洋是目前最大的，跨度几乎占到地球周的三分之一。

You can choose anything that you want: a poem, the state capitals, the first 25 digits of PI. Whatever.

你可以选择任何想记住的东西：一首诗、各州的首府周率的前25位。什么都行。

Again for more than two thousand years, it was impossible to conceive the planets as moving in paths other than circles.

同样，两千多来人们“不可能想象”行星是以轨道而非周的形式运行的。

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

是具有半径和周的二维图形，周是围绕的距离。

The Greek word, gyro is used to describe the circling motion of the rotisserie that holds the meat.

希腊语的gyro是用来描述旋转烤肉架的周运动。

Nevertheless, when I scaled a high escarpment, I could see no volcanoes within a radius of several miles.

可是，我攀上一座高耸的悬崖，半径几海里的周内望不见火山。

You see, for the most part, the earth rotates around the sun in a nearly perfect circle.

你看，在大多数情况下，地球绕着太阳以近乎完美的周旋转。

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

涡流是指做周运动的大量水流。