Let's say I have a cylinder of radius a centered on the z-axis.

已知以z -轴为轴心半径为a的圆柱体。

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That is a vector field in which the trajectories are going to be circles centered in the z-axis and our vector field is just going to be tangent to each of these circles.

这是一个向量场，其中旋转轨道是，以z轴为圆心的圆周，并且这个向量场与每个圆相切。

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In the longitudinal section, it can be divided into port deformation zone, transition zone and undeformed zone along the z-axis, according to the morphology of deformation zone.

在纵截面上，根据变形区形态，可沿轴向将变形区分为端口变形区、过渡变形区和未变形区。

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So what we can say is look at each of these separately, so if we start with looking at the 2 p z orbital, the highest probability of finding an electron in the 2 p z orbital, is going to be along this z-axis.

我们可以来分别看看这些图，首先来看看2pz轨道，在2pz轨道里,找到电子的最大概率，是沿着ｚ轴。

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

We have two of them on the z-axis like this.

他们俩的z轴都这样。

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