名词中文翻译
中文翻译：重力线
同义词：
['gravitational line', 'gravity axis']
例句：
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1. The gravity line is the line of force between the sun and Earth.
重力线是太阳和地球之间的力线。
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2. The gravity line is used to measure the distance between two points on the Earth's surface.
重力线用于测量地球表面两点之间的距离。
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3. The gravity line is a crucial factor in determining the motion of planets.
重力线是确定行星运动的关键因素。