这个圆的半径比那个圆的半径大。

The radius of this circle is larger than the radius of that circle.

这个圆的半径是已知的。

The radius of this circle is known.

这个圆的半径是5厘米。

The radius of this circle is 5 centimeters.

圆的半径是其直径的一半。

The radius of the circle is half its diameter.

测量圆的半径以找到它的周长。

Measure the radius of the circle to find its circumference.

这些圆的半径都相等。

The radii of the circles are all equal.

在清单10 中，3秒钟后圆的半径将被设为50，持续时间为3秒。

In Listing 10, after 3 seconds the circles radius is set to 50 for 3 seconds.