名词
中文翻译：基准线
同义词：
['reference line', 'datum line', 'reference point']
例句：
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1.The engineer used the Y-datum line to measure the distance between two points on the map.
工程师使用Y-基准线测量地图上两点之间的距离。
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2.The construction company used the Y-datum line to ensure that the new building was level with the existing one.
建筑公司使用Y-基准线确保新建筑与现有建筑保持水平。
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3. The surveyor used the Y-datum line to mark the location of a water source in the area.
测量师使用Y-基准线标记该地区水源的位置。