Drilling fluid (mud) is usually a mixture of water, clay（粘土）, weighting material（加重剂）, and a few chemicals.
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solid weighting material 固体加重材料
high-density weighting material 加重材料
Since the purpose is to minimize alteration, a fresh core has often been drilled with a bland mud, either water - or oil-base, but with a minimum of chemical additives and weighting material.
其目的是为了将岩心的变化降到最低，通常用泥浆或水基、油基泥浆钻取岩心，但是使用少量的化学添加剂和加重物质。
By using this material in Guangxi, the application of the linear autoregression model associated with weighting and recursive estimation was introduced for forestry.
以广西实际资料具体阐述了线性自回归加权递推模型在大林业中的应用。
Due to between the weighting functions and the robustness have no material method can be followed, the improved results mostly found by the testing method.
由于加权函数和鲁棒性能要求之间没有具体方法可循，大多是采用试凑的方法得到较好的结果。
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