土难
土难
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红粘土原状土样难予进行长期有效的保护。
It is difficult to effectively preserve undisturbed sample of red clay in a long term .
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然而,保存完好的古水稻土剖面极难获得。
However , it is extremely difficult to obtain a well-preserved ancient paddy soil profile .
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在沿海平原和辽河流域盐碱土上很难种植旱地作物。
It was difficult for upland crops to grow on the saline-alkali soil in the coastal plain and Liaohe river regions .
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有限元分析法在理论上较成熟,但因其存在土体模型和土性参数难确定等困难,难以实际应用。
The finite element method is mature in theory , but it is difficult to fix the earth model and the soil parameters , so being difficulty to be practice applied .