spin axis

基本解释

Since that pulls mass closer to the planet's spin axis, it causes the planet to rotate faster – just as an ice skater spins faster when she pulls her arms towards her body.
由于质量朝地球旋转轴靠拢，这就导致地球旋转速度加快 --- 就像一个速度滑冰选手，当她把胳膊向身体收拢时就会旋转得更快。
The shaft is structured to optionally move in the offset cam, and the display panel unit is structured to rotating around a spin axis when the shaft moves in the offset cam.
该轴构造成在偏心凸轮内选择性地移动，并且显示面板单元构造成当轴在偏心凸轮内移动时绕旋转轴线旋转。
ip.com
Over the next century, the subtle effect is expected to cause the northern pole of Earth's spin axis to shift by roughly 1.5 centimetres per year in the direction of Alaska and Hawaii.
据报道，地球北极端极轴的移动是朝向阿拉斯加方向每年移动1.5厘米。
leuxue.blog.163.com

One way to think about it, if we want to use a classical analogy, which often helps to give us an idea of what's going on, is the spin of an electron, we can picture it rotating on its own axis.
如果我们用一个，经典的比喻来考虑它的话，这经常会帮助我们建立起一些概念，就是我们可以把电子的，自旋想象是它绕着轴自转。
麻省理工公开课 - 化学原理课程节选
So you can see, if it's spinning on its own axis in this direction we'd call it spin up, where as this way it would be what we call spin down.
你们可以看到，如果它绕自己的轴朝这个方向转,我们就说它是自旋朝上，这个方向我们叫它自旋朝下。
麻省理工公开课 - 化学原理课程节选

In particular, every electron has its own magnetic field aligned with the axis of its spin.
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Engadget had a chance to give Axis a quick spin, and we largely like what we see, even if we'd say it's not for everyone.
ENGADGET: Yahoo Axis on desktop, iOS unifies your bookmarks, makes the web visual (hands-on)