| 词汇 | silt |
| 释义 | silt noun[ U ] uk /sɪlt/ us /sɪlt/ sand or soil that is carried along by flowing water and then dropped, especially at a bend in a river or at a river's opening（尤指河湾或河口处的）淤泥，泥沙 Soil alluvial boulder clay clay clayey cover crop earthiness frozen humus lime loam ooze peat moss sandy sedimentation soil solarization solarize topsoil unploughed worm cast silt | American Dictionarysilt noun[ U ] us/sɪlt/ sand or earth that has been carried along by flowing water and then left esp. at a bend in a river or at a river’s opening Examples of siltsilt The basal parallel-bedded sands and silts of this unit contain abundant but fragmentary carbon compressions and poorly preserved compressed coniferous branches. The upper half is more heterogeneous and consists of an irregular alternation of clays, silts and finer sands. Thickness of individual silt beds increases towards the top, while representation of clayey silt layers decreases. Modification of silt microstructure by hydrocarbon contamination in freezing ground. The soil texture is silty clay loam with 29, 47, and 24% sand, silt and clay respectively, and illite is the dominant clay mineral. Conformably overlying the sandstones are approximately 5 m of beige-brown to olive green weathering sands and silts. In medium-textured soils, such as silts, the conditions discussed above are satisfied. The soil texture is 46 % sand, 46 % clay and 8 % silt. The surface 15 cm layer has 69.7 % sand, 18.2 % silt and 12.0 % clay. Below the clay there is sandy soil containing only from 4-5 to 8-8 per cent, silt and clay. Mechanical analysis was used to determine percent sand, silt and clay using a soil hydrometer method17,18. The calcrete is of two types; the first one is rich in silt with low clay content, and generally overlies the mottled silty sandstone lithofacies. Physical soil analysis revealed a sandy loam texture with fractions of 78% sand, 10% silt and 12% clay. The role of glaciers in producing silt is emphasized, and the sources and redistribution mechanisms are explained. Furthermore, through x-radiographic, grain size and magnetic susceptibility analyses, large-scale rhythmic changes between sand beds and fine silts were detected in the core. 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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