名词
中文翻译：Unknown
同义词：
['n-fold axis', 'n-fold axis', 'n-fold axis']
例句：
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1. The n-fold axis of the crystal is perpendicular to the plane of the crystal.
晶体的n次轴与晶体平面垂直。
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2. The n-fold axis of the crystal is parallel to the plane of the crystal.
晶体的n次轴与晶体平面平行。
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3. The n-fold axis of the crystal is at an angle to the plane of the crystal.
晶体的n次轴与晶体平面成一定角度。