名词
中文翻译：等时线
同义词：
['time-interval line', 'time-space line', 'temporal interval line']
例句：
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1. The graph shows the distribution of population across different age groups.
这张图显示了不同年龄段人口的分布。
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2.The researchers used a time-interval line to measure the distance between two points on the map.
研究人员使用一条时间间隔线来测量地图上两点之间的距离。
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3. Time-interval lines are often used in engineering to indicate the relative positions of objects or points.
时间间隔线在工程中常用来指示物体或点之间的相对位置。