The earth rotates once a day on its axis. 地球绕它的自转轴一天旋转一周。
The orientation of the equatorial belt suggests the parent star maintained the same spin axis both before and after it exploded. 环赤道带的方向说白，前身星在爆发前后的自转轴取向保持不变。
In this axial turbine, steam always flows along the axis of rotated axis, thus, all blades extend with the radiation shape along the axis outward. 在这种轴流式涡轮机中，蒸汽总是沿主轴的旋转轴流动的，因此，叶片由主轴向外呈辐射状展开。
