Many things widely used in a modern lifestyle cannot be reused, but because they have toxic contents (as, for example, dry batteries have mercury), it is necessary to recover, concentrate, and deal with them so as to reduce damage to the soil, water, and human health.
許多現代生活中被大量使用過的東西，即使無法再利用，但因含有毒物質，如乾電池含有水銀，也需要回收集中處理，以減少危害土壤、水源、人體健康……，避免造成無法收拾的後果。