The principles, methods and process of automated extraction of natural stream networks of watershed based on raster DEM are described.

论述了如何基于栅格dem自动提取流域自然水系的原理、方法和流程。

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Google has marked today's lunar eclipse with a special 'doodle' and live video stream to show the progress of the natural phenomenon.

为了纪念今天的月全食，谷歌推出了一个特别的“涂鸦”，用实时视频流展示了这一自然景观的全过程。

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A natural pass (elevation 1, 640 feet [500 metres]) that was cut through the Cumberland Plateau in the eastern United States by former stream activity.

自然形成的坎伯兰山口(海拔1640英尺[500米])曾经是水口，峡谷中的水流沿山口穿过美国东部的坎伯兰平原。

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Sabrina The Lady is only rescued once the attendant spirit -- calls on the nymph Sabrina, the genius loci -- the natural spirit of the Severn stream, which is the river that separates England from Wales.

只有随从号召美丽的少女,和一个天才的场所-,它是赛文河流的自然精神，是分割英格兰和威尔士的河流。

耶鲁公开课 - 弥尔顿课程节选

They are widely regarded as a world-class natural attraction containing marvellous stream passages formed by three rivers that sink underground on the slopes of Cuilcagh Mountain.

UNESCO: Olympic torch carried through iconic Geopark

Fractionators take a mixed stream of natural gas liquids (the liquid stuff that comes out of the ground along with natural gas) and process it into pure products like ethane, propane and butane.

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When activated, the five blocks ignite one after another for about a minute apiece, creating the steady stream of smoke that accompanies the natural smoke from the burned ballot papers.

NPR: Argentine Jorge Bergoglio Elected Pope Francis