形容词
中文翻译：无色的
同义词：
['achromatic', 'colorless', 'transparent例句：1. The aplanatic point is the point where light rays are parallel.（无色点是光线平行的地方。）']
例句：
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1. The aplanatic point is the point where light rays are parallel.
无色点是光线平行的地方。
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2.The aplanatic point is used to measure the distance between two points on the Earth's surface.
无色点用于测量地球表面两点之间的距离。
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3. The aplanatic point is also known as the zenith point.
无色点也被称为正午点。