Precession, basically is the change in the direction of earth's axis of rotation.

岁差，基本上是地球自转轴方向的改变。

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The axis of a circle is its diameter.

圆的对称中心线就是直径。

《牛津词典》

The main axis of the planet's orbital ellipse shifts each time when it goes around the sun.

当行星绕太阳运行时，其轨道椭圆的主轴每次都会改变。

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Shaul Mofaz, an Israeli parliamentarian and former army chief of staff, says a radical axis of Iran,Syria, Hezbollah and the Palestinian militant group Hamas in Gaza are trying to destabilize the Middle East.

VOA: standard.2009.11.04

So, we'll talk about this other axis of style on the course, writing code that looks pretty and as well aesthetically laid out.

我们来讨论一下这个中心对称的程序，这程序写出来的结果很漂亮,完全按照美学角度摆放。

哈佛公开课 - 计算机科学课程节选

Let's go on to talk about the other axis of music and that is rhythm or duration.

让我们继续讨论音乐的其它维度,节奏或时值

耶鲁公开课 - 聆听音乐课程节选

But too many companies focus on being excellent in only one axis of competition, not all.

FORBES: Excellence Is an Attitude

This is the country President Bush once called part of the axis of evil.

NPR: North Korea Dropped From Terror List

Tuscaloosa and Joplin, while hardly tornado-free, are a ways off the usual major axis of destruction.

FORBES: The Great Tornadoes Of 2011 Put In Perspective