The method of stack velocity analysis based on relief surface presented in the paper uses double-square-root equation to compute the travel time of reflections, which is suitable to use in the area w.

本文提出的基于起伏地表的叠加速度分析方法，应用双平方根方程计算反射波的旅行时间，可适用于地形起伏剧烈地区。

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However, a slash or a double slash ( / or // ) at the front of a predicate in square brackets does not have a context and therefore refers to the root of the document.

但是，方括号中谓词前的单斜线或双斜线（/ 或 //）没有上下文，所以引用到文档的根。

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Remember that the method Math.sqrt returns a double, which is therefore only an approximation of the actual square root.

记住方法Math . sqrt返回的是一个double型，也就是说这只是一个大概值。

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