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waste use
desert.	废物利用
waste use The incorporation of wastes into natural or artificial cycles, mainly in order to recover secondary raw materials or energy
environ.	废料利用 (将废料并入到自然的或人工的循环中，主要是为了恢复再生原料或能源。)

waste use: 17 phrases in 7 subjects

Ecology	2
Electronics	1
Environment	3
Metallurgy	2
Oil / petroleum	1
Technology	5
Textile industry	3