等时线所属现代词，指的是天文学专有名词。
本文介绍的方法，对时间场法求取等时线方法进行了改进。
The method introduced in this paper improves the contour way which is gained from time field.
异常铅二次等时线是普通铅同位素地质学研究中非常重要的一个课题。
The study on secondary isochron of anomalous lead is a very important problem in the common lead isotope geology.
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.
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