名词短语
中文翻译：隧道顶部线
同义词：
['隧道顶部轮廓线，隧道顶部线条例句：1. The tunnel topline is critical for navigation in urban areas.（隧道顶部线在城市地区的导航中至关重要。）']
例句：
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1. The tunnel topline is critical for navigation in urban areas.
隧道顶部线在城市地区的导航中至关重要。
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2.The engineer used the tunnel top line todetermine the best route for construction.
工程师利用隧道顶部线确定了施工的最佳路线。
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3. The tunneltop line was carefully measured and marked onthe map.
隧道顶部线被仔细测量并在地图上标记。