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单词 hardpan
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Examples ofhardpan

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The ditches around the circles penetrated thehardpan, helping to drain the prairie soil.
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Not until the 19th century, when they succeeded in breaking up thehardpanand cultivating arable land, did sheep farming decline.
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The iron and humus particles released by the topsoil precipitate onto this impervioushardpan.
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Visitors are asked to stay on the trails and off bare rock andhardpanto avoid damage to fossils and fragile soils.
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The depth tohardpanranged from 1 foot to 6 feet.
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He soon noticed the phenomenon referred to ashardpan(the creation of a water resistant soil layer).
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Care was taken to maintain vertical profiles every five feet and to keep a clean floor in the trench going down to thehardpan.
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The surrounding area has leached, gravelly-sandy soils with layers ofhardpan, covered by open sand, large areas of heathland and extensive coniferous forest.
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The stream meander belt cuts below thehardpan.
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Part of this soil profile includes an underlying clay or ironhardpan.
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This type of landscape typically has a shallow basement layer such as bedrock,hardpan, claypan, or densely bedded gravel.
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Other soils may have an impervious layer of mineralized soil, called ahardpanor relatively impervious rock layers may underlie shallow soils.
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An area can have layers of sandy soil, fractured bedrock, clay, orhardpan.
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The results are primarily determined by how extensive and / or intractable thehardpanis.
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Not until thehardpancould be broken, enabling the cultivation of arable land, did sheep farming decline.
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Its surface is hilly upland made of shaly loam atophardpan, while the valleys consist of gravelly loam and alluvium.
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Common salts such as sodium ions contained in wastewater can fulfil this role and lead to a localizedhardpanin some soil types.
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A thick layer of ash can turn into a calcium richhardpanas tough as cement after being rained upon.
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Winter rains may be necessary to loosen thehardpansoil where some nests are deposited.
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The entire structure was built on an artificial foundation set atop 3,128 pilings driven deep into the underlyinghardpan.
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These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.
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更新时间：2025/2/10 21:24:23