coal pillar for water preserving  保水煤柱; 通道

head of water preserving pressure  保压水头

preserving water and soil  保持水土

water preserving capability  持水功能

water preserving mining  保水采煤

water-preserving rate  保水率

the efficient nutritious water-preserving agent  高效营养保水剂

Water-preserving composite  复合保水剂

economizing water and preserving fertilizers  节水保肥

high pressure water for removing phosphorus  高压水除鳞

mining of water resources preserving  水资源保护性开采

reducing water injection pressure and improving injection capacity  降压增注

water temperature preserving pressure  保压水温

water-removing press  脱水压榨机

water water energetic reactor  水-水动力反应堆; 水水动力反应堆

water water reactor  水水反应堆; 水-水反应堆

Water-Water Gas Engine Driven Heat Pump (WWGEHP)  水-水燃气机热泵

Water-water Heat Exchanger  水-水换热器

Water-water Heat Pump  污水源热泵