单语范例（未经PONS编辑处理）
英语
- They form through the lateral coalition of individual barchans and indicate increasing sand supply.en.wikipedia.org
- Barchan sand dunes are located on the valley's edge.en.wikipedia.org
- If the prevailing wind then becomes dominant for a lengthy period of time the dune will revert to its barchan form, with one exaggerated wing.en.wikipedia.org
- With the buildings of the set as fixed geographic points, scientists were able to use satellite imagery to track the movement of the barchan over the years.www.gizmodo.com.au
- Barchan dunes are produced by strong winds blowing across a level surface, and are crescent-shaped with the concave side away from the wind.en.wikipedia.org
- In the sheltered troughs between highly developed seif dunes barchans may be formed because the wind is unidirectional.en.wikipedia.org
- Technically, they're called barchan dunes.www.slate.com
- Apart from this nonlinearity, barchans behave rather like solitary waves.en.wikipedia.org
- The sound is similar to a loud, low-pitch, rumble, and it emanates from the crescent-shaped dunes, or barchans.en.wikipedia.org
- Earlier models predicted that crescent-shaped sand dunes called barchan dunes should grow to at least 500 meters long -- but many are only 100 meters.www.wired.com
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