其他矿渣及矿灰，包括海藻灰(海草灰)；焚化城市垃圾所产生的灰、渣。

Other slag and ash, including seaweed ash (kelp); ash and residues from the incineration of municipal waste.

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矿工们挖去表层土，然后把这些闪着点点金光的粘土铲进一个灰坑内，用酸来提取出稀土矿。

Miners scrape off the topsoil and shovel golden-flecked clay into dirt pits, using acids to extract the rare earths.

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尤其对于含硅灰或矿粉的混凝土，复合骨料降低混凝土的自收缩效果更好。

For concrete containing silica fume or ground slag, the reduction of auto-shrinkage is more effective by composite aggregate.

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