二、地球上的基本点、线、圈 把地球看做第二近似体即椭圆体，如图1-1-2 所示，O 为 地球中心： 地轴(axis of the earth)—地球自转的轴( S N P P )，即 通过地球中心连结南极和北极的一条假想的线。
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The galactic forces are moving the axis of the Earth which is not involved with the tilt of the planet.
银河系的力量正移动着地球的轴线，这和星球的倾斜无关。
The earthquake also shifted the so-called figure axis of the earth, which is the axis that the earth's mass is balanced around.
地震也改变了地球的几何中轴线，中轴的周围地球的重量是平衡的。
This paper optimized the principal axis of the earth auger by ANSYS, introduced the mathematic model and the steps of the optimization design.
用有限元分析软件ANSYS对挖坑机主轴进行优化设计，从理论上说明优化设计的数学模型，并给出具体的设计步骤。
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