名词短语
中文翻译：螺旋的切线点
同义词：
['tangent point', 'vertex of a spiral']
例句：
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1.The point of tangent to the circle is where the radius intersects the circle at right angles.
圆的切线点是半径与圆相交成直角的地方。
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2. The vertex of the spiral is the point where the lines converge.
螺旋的顶点是线条交汇的地方。
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3. The point of tangent to the spiral was used as a reference point for measuring distances.
螺旋的切线点被用作测量距离的参考点。