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.
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