名词
中文翻译：永久轴心
同义词：
['perpetual axis', 'permanent axis', 'perennial axis']
例句：
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1. Theplanet's axis is tilted atan angle of about 23 degrees.
这颗行星的轴倾斜了大约23度。
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2. The axis of the Earth's rotation is not perfectly vertical.
地球自转的轴并不是完全垂直的。
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3. Theaxis of the sundial is aligned with the shadow cast by the sun.
日晷的轴与太阳投射的影子对齐。