That's phi is the angle downwards from the z axis.

这个角度是φ，它是从z轴偏转的角度。

youdao

Well, I guess even then, you could center it on the z axis.

我猜即便那时，你也会把中轴定为z轴。

youdao

OK, so moment of inertia about the z axis so, what's the distance to the z axis?

关于绕z轴的转动惯量,到z轴的距离是多少？

youdao

If we have, coming along this z axis, another carbon atom, we can actually form one bond between the two carbon atoms there.

如果我们在z方向，有另外一个碳原子，我们可以在,两个碳原子之间形成一个键。

麻省理工公开课 - 化学原理课程节选

Essentially what we're seeing is overlapping in this z axis here.

本质上我们看到的是在z轴这里的交叠。

麻省理工公开课 - 化学原理课程节选

And the convention is that when two atoms bond, they bond along the z-axis.

我们的惯例是，两个轨道成键，键轴为Z轴。

麻省理工公开课 - 固态化学导论课程节选

It gave our choreographers a new tool to move the dance into the Z-axis.

FORBES: Dancing In Your Face. Director Jon Chu talks 'Step Up 3-D.'

In this demonstration, we're shown how users can manipulate objects on a 3D plane via the Z-axis by pulling the pen away from the display.

ENGADGET: Hands-on with wireless, ultrasonic stylus and touchless gestures at MWC (video)

During their test drive, the team at Trusted Reviews found the device to work quite well -- mostly due to its 2, 000dpi laser sensor -- although they thought that the top-mounted buttons were somewhat difficult to access, and joystick mode can't be used to manipulate the Z-axis.

ENGADGET: Fanatec Head$h0t gaming mouse reviewed