Mr Junger's study, a platoon of airborne infantry, was deployed to the Korengal valley, a remote and craggy tract of north-eastern Afghanistan.

荣格尔的研究对象为空降步兵的一个排，部署于阿富汗东北部偏远崎岖的库伦·加尔(Korengal)山谷地带。

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Each sequence is composed of incised valley sandstone of low system tract, limestone, marl, coal and mudstone of transgressive system tract and clastics and coal of high system tract.

各层序分别由低位体系域的下切谷充填沉积的砂岩、砂砾岩，海侵体系的灰岩、泥灰岩、泥岩、煤和高位体系域的碎屑岩和煤组成。

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In a corner of a Silicon Valley neighborhood of modest tract homes, robots are quietly at work generating electricity.

FORBES: Can Solar Robots Cut The Cost of Renewable Energy?