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man-made pollution
 man-made pollution
UN ecol. 人为污染
| source
 source
gen. ; 来源
hydroel.st. 源头; 源点
met. 起源; 原因; 成因
plann. 始点
semicond. 源区

to phrases
man-made pollution
UN, ecol. 人为污染
man-made pollution
: 8 phrases in 4 subjects
Ecology2
Oil / petroleum1
Technology4
Water resources1