Glossary term: 轴
Description: 轴是一个可以用来定义坐标系的假想线。旋转轴是一个物体绕其旋转的假想线。这一假想线可以是一个系统（如星系）的旋转轴，也可以是一个固体（如小行星）的旋转轴。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
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