名词
中文翻译：观察线
同义词：
['observation string', 'surveying string例句：1. The scientist used a sighting string to measure the distance between two points on the map.（科学家使用观测绳来测量地图上两点之间的距离。）']
例句：
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1. The scientist used a sighting string to measure the distance between two points on the map.
科学家使用观测绳来测量地图上两点之间的距离。
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2.During the construction of the new bridge, a sighting string was used to ensure the stability of the structure.
在建造新桥的过程中，使用观测绳来确保结构的稳固。
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3. The surveyor used a sighting string to mark the starting point for the survey.
测量员使用观测绳来标记调查的起点。