The typical trench system in World War I consisted of a series of two, three, four, or more trench lines running parallel to each other and being at least 1 mile (1.6 km) in depth.

第一次世界大战时典型的堑壕体系由2至4条以至更多的一系列壕沟组成，壕沟之间彼此平行，而且纵深可以达到1英里（合1.6公里）。

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Three approaches to the graphic representation for lines of intersection are introduced in this article, namely, central projection, parallel skew projection and arc line projection.

本文介绍了图解截交线的三种方法，中心投射法、平行斜投射法、弧线投射法。

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The design principle is analysed for band-pass filters using three parallel coupled-lines and the related design curves are given.

本文分析了三线平行耦合线带通滤波器的设计原理，给出了有关设计曲线。

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The next zone is where the cooking gets done two parallel lines of countertop, forty-some feet long and just three shoe-lengths apart, with fifteen people pivoting in place between the stovetops and grills on the hot side and the neatly laid-out bins of fixings (sauces, garnishes, seasonings, and the like) on the cold side.

NEWYORKER: Big Med