1. The mining company found traces of gold in the alluvia of the river.(这个采矿公司在河流的沉积物中发现了金矿的痕迹。)
2. After the flood, the alluvia covered the farmland, leaving a thick layer of sediment.(洪水过后,沉积物覆盖了农田,留下了一层厚厚的沉积物。)
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