axis

The earth revolves both round the sun and on its own axis.(地球既公转又自转。)

The Eiffel Tower is a wonderful way of showing the degree to which the vertical axis is virtual.(埃菲尔铁塔是展示垂直轴虚拟程度的绝佳方式。)

The axis of plane symmetry.(飞机的对称轴线。)

The axis of a circle is its diameter.(圆的对称中心线就是直径。)

The principal square root function is defined using the nonpositive real axis as a branch cut.(主平方根函数是使用非正实轴作为分支切割定义的。)

The planet Venus takes 243 earth-days to turn once on its axis, so incoming heat from the sun is added and distributed at a more leisurely, observable pace.(金星自转一周需要243个地球日，因此来自太阳的热量以更悠闲、更容易观察到的速度被吸收和分配。)

The earth revolves on its axis.(地球环绕自身的轴心转动。)

In England, the Saxons are thought to have used both horizontal- and vertical-axis wheels.(在英格兰，通常认为撒克逊人同时使用水平和垂直轴的轮子。)

This is the time axis.(时间轴就是横轴。)

The third axis is the longitudinal axis.(第三个轴是纵轴。)