| 词汇 | leach |
| 释义 | leach verb[ T ] environment specializeduk /liːtʃ/ us /liːtʃ/ [ I or T ] When a chemical substance leaches or is leached from a material, especially soil, it is removed by the action of water passing through the material: 漂洗，过滤（尤指土壤） The calcium, potassium, and magnesium ions are leached or washed out of the top soil into lower inaccessible subsoil.钙、钾和镁离子被滤出表层土壤流入低层土壤却无法被吸收。 [ T ] When soil, etc. has been leached, it has had chemical substances removed from it: （指土壤等）被漂洗，被过滤 The soil has been so heavily leached through intensive farming that it is no longer fertile.过度耕作使养分大量流失导致土地贫瘠。 Removing and getting rid of things abandonment banish be scattered to the four windsidiom bin cast someone/something aside/away/off dumping eradication eradication of something erase erasure evacuate evacuate someone from something shed shedding shoo shrug shrug something off sling toss turf You can also find related words, phrases, and synonyms in the topics: Physical & chemical processes Removing and extracting leach | American Dictionaryleach verb[ I/T ] us/litʃ/ (of a substance) to come out of or be removed from another substance, esp. dirt, by passing water through it Examples of leachleach The lower unit is characterised by an average porosity of about 13% which is largely derived from vugs produced by leaching of replacement anhydrite. The data may suggest that growing lowland rice during the wet season could reduce the amount of nitrate leached to the shallow aquifer. Under such conditions, nitrate can be leached and can contaminate the shallow aquifer which is also a source of drinking water. In fields with low erosion rates, there is little increase in leaching. As the topsoil was removed, leaching increased by 40 per cent, on average, over the 30-year time horizon. The lowest maize yield harvested in 1996/97 under sole maize was attributed to leaching and water logging due to excessive rainfall and lodging. The leaching fraction of 0.2-0.3 was provided for all treatments during the course of the experiment. The soil was then leached with 95 % ethanol to remove free salts, air-dried and passed through a 2-mm sieve. Data were summarized as mean cumulative cation losses from leaching columns of each treatment after each leaching event. The nitrates can be washed, or leached, out of the soil by rain into groundwater. Heavily leached soils also have a tendency to be easily eroded as the water washes away soil particles quickly. The farmer must try to prevent nitrates leaching through the soil, to limit the economic and environmental costs that this would generate. From this time onwards, leaching and erosion of soil was severe, causing major alluviation of valleys. In either case the toxic or radioactive waste is trapped in the solid, preventing it from leaching into the local water table. The iron oxide presumably gets leached out from the surface of the cultivated land. See all examples of leach 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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