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汉语拼音：xià diàn

1.谓人民有沉溺之患。语出《书．益稷》"洪水滔天，浩浩怀山襄陵，下民昏垫。"孔颖达疏引郑玄注"昬，没也;垫，陷也。禹言洪水之时，人有没陷之害。"亦指人民陷于苦难之中。

2.被水淹没。

1. 谓人民有沉溺之患。语出《书·益稷》：“洪水滔天，浩浩怀山襄陵，下民昬垫。” 孔颖达 疏引 郑玄 注：“昬，没也；垫，陷也。

   禹 言洪水之时，人有没陷之害。”亦指人民陷于苦难之中。 南朝 梁 沉约 《郊居赋》：“当降监之初辰，值积恶之云稔。寧方割於下垫，廓重氛於上墋。”

2. 被水淹没。

   《魏书·游肇传》：“ 胊山 蕞尔，僻在海滨，山湖下垫，民无居者。”

• The threshold friction velocity over the Loess Plateau depends on the wind direction, due to the complex terrain and inhomogeneous surface.

  由于受地形及非均匀下垫面的影响，黄土高原的临界起沙摩擦速度与风向有关。

• To avoid the appearance of imbroglio , still should be in body underlay a few towel.

  为了防止一团糟的场面，还应在身下垫一些毛巾。

• An interaction factor is introduced to deal with the multiple reflectance between the atmosphere and the underlying surface.

  还引入了一相互作用因子来处理大气与下垫面之间的多次反射。

• The characteristics of atmospheric physical environment in urban areas are to a large extent determined by the status of underlying surface.

  城市下垫面状况在很大程度上决定城市大气物理环境的特征。

• As an important part of underlying surface, cryosphere is in the process of continuous interaction with atmosphere.

  冰冻圈作为下垫面的一个重要组成部分，与大气处于不断的相互作用过程中。

• The sweat was gathered from a selection of men who had polyester pads attached to their armpits.

  这些汗液从一组被挑选出的男性的身上获得，他们的腋窝下垫了涤纶垫。

• The results show that the runoff coefficient is easier to reach a steady value for a poor infiltrate surface.

  结果表明：弱透水性的下垫面径流系数容易达到较高的稳定值，透水砖的下渗能力接近草地。

• The grain characteristic of falling dust and different height surface and their relationship were analyzed by the field observation data.

  研究以野外观测为主要手段，分析了不同高度大气降尘与不同下垫面沙粒的粒度特征及二者间的关系。

• Hereby, the prediction equation of temperature on different underlying surfaces is obtained by the statistic method.

  在上述分析的基础上，应用统计学方法建立了几种下垫面表面温度的预报方程。