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水系 shuǐxì
water.res.	assainissement m; drainage m

水系: 64 phrases in 14 subjects

Environment	14
Fishery fishing industry	2
Food industry	1
General	2
Hydrology	2
Labor organization	5
Name of organization	11
Oceanography & oceanology	1
Pulp and paper industry	1
Soil science	1
Technology	1
United Nations	8
Waste management	1
Water resources	14