axis

/ˈæksəs/

a straight line through a body or figure that satisfies certain conditions

中文释义：轴；轴线

The Earth rotates on its axis once every twenty-four hours.

地球每二十四小时绕其自转轴旋转一周。

In a graph, the horizontal axis represents time and the vertical axis shows values.

在图表中，水平轴代表时间，垂直轴显示数值。