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working substance
agric.	工［作介］质
auto.	工作物; 介工质
el.	工作介质
met.	工作介质; 资用物质
space	工质
tech.	作用物质; 工作用物; 可用物质

working substance: 3 phrases in 3 subjects

Automobiles	1
Chemistry	1
Technology	1