...永久硬度（非碳酸盐硬度） permanent hardness (noncarbonate hardness) 负硬度negative hardness 地下水总矿化度（溶解性固体总量） total mineralization degree of groundwater (total dissol ..
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Its strength lies in the fact that it resists the negative effects of hardness in the water on its ability to remove heavy metals.
它的优势在于它能够水中硬度的负面影响，从而消除重金属。
With the merits of high hardness, high thermal conduction, negative electron affinity, diamond is deemed one of the preferred materials of the field emission cathode.
金刚石因具有高硬度、高热导率、负电子亲和势等优点而成为场发射阴极的首选材料之一。
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