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自然循环 zìrán xúnhuán
el. gravity circulation
tech. natural circuit; natural cycle; natural air circulation
wind. natural circulation
发动机冷却系统自然对流循环
auto. natural circulation
自然循环: 48 phrases in 12 subjects
Agriculture2
Automobiles2
Chemistry1
Ecology1
Electronics11
Finances1
Hydroelectric power stations2
Metallurgy2
Nautical2
Refrigeration1
Solar power1
Technology22