相同时间或年代的点的连线，比如地震剖面中的反射和等时线图中的等值线等。
A line joining points of equal time or age, such as a reflection in a seismic profile or contours in an isochron map.
时间结构的表达则从时间结构的形态方面总结出等时线、等时圈、时间廓线图和网络图等表达形式；
Thirdly, summarize four expressing forms of urban time structure of which isotime curve, isotime circle, time contour and time network.
时间结构的表达则从时间结构的形态方面总结出等时线、等时圈、时间廓线图和网络图等表达形式；
Thirdly, summarize four expressing forms of urban time structure of which isotime curve, isotime circle, time contour and time network.
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