名词
中文翻译：轴向
同义词：
['axis', 'axis line例句：1. The z-axis is the vertical axis of a coordinate system.（z-轴是坐标系统的垂直轴。）']
例句：
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1. The z-axis is the vertical axis of a coordinate system.
z-轴是坐标系统的垂直轴。
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2.The z-axis is used to determine the direction of rotation in a 3D space.
z-轴用于确定三维空间中旋转的方向。
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3. In engineering, the z-axis is often used to represent the depth or height of a structure.
在工程学中，z-轴通常用来表示结构的深度或高度。