名词
中文翻译：旋涡轴向
同义词：
['vortex axis', 'helical axis']
例句：
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1.The vortex axis of the tornado is where it forms and rotates.
龙卷风的旋涡轴在哪里形成和旋转。
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2. The helical axis of the spiral galaxy is a key to understanding its structure.
螺旋星系的螺旋轴是理解其结构的关键。
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3. The axis of rotation in a rotating object is the direction in which it moves.
旋转物体的旋转轴是它移动的方向。