名词
中文翻译：水平线
同义词：
['horizontal line', 'contour line']
例句：
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1.The levelling line is drawn to ensure that the buildings are evenly spaced.
水平线被绘制出来，以确保建筑物均匀分布。
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2.The contour lines of the land show the natural features of the area.
土地的等高线显示了该地区的自然特征。
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3.The engineer used a levelling line to measure the distance between two points.
工程师使用水平线测量两点之间的距离。