Moreover, products mined or gathered using explosives, drilling and digging have more fissures, the colors are not uniform and the quality is low, so the prices are also inferior. Besides, most of the rock gets smashed and lost, so that only ten or twenty percent is actually worth keeping.
而用炸、鑽、挖的方式採礦，取出的產品裂紋多、色澤不統一、品質低，價格也差；且礦石大部分被破壞流失，真正的收穫只有一、二成。