Constant passage of machinery over the same area compacts the soil and limits the development of roots.

机械经常在相同地带内通过，会将土壤压紧并限制根系的发育。

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According to the soil dielectric constant and its microwave emissivity, the soil microwave brightness temperature is deduced, and its mathematical model is given.

根据土壤介电常数及相应的微波发射率，推算出亮度温度值，并给出了数学模式。

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The accuracy of soil water content measured by TDR depends on two key factors: soil dielectric constant and the calibration model of soil volumetric water content vs. dielectric constant.

时域反射仪测定土壤体积含水量的准确度取决于两个关键因素：土壤介电常数的测定准确度以及土壤含水量和介电常数之间的关系模型。

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Engineers have found that wetlands, grassy fields and soil or sand filters can take in stormwater with different levels of pollution and release water with a relatively constant cleanliness.

VOA: standard.2010.08.04