名词短语
中文翻译：重力线
同义词：
['gravity line', 'gravity path例句：1. The line of gravity runs through the center of the room.（重力线穿过房间的中心。）']
例句：
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1. The line of gravity runs through the center of the room.
重力线穿过房间的中心。
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2.The line of gravity is parallel to the floor.
重力线与地板平行。
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3.The line of gravity is a crucial factor in determining the stability of the structure.
重力线是决定结构稳定性的关键因素。