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angl. 顶环
auto. 第一道活塞
met. 【铁】 炉顶钢圈; 炉头钢圈; 【钢】炉顶钢圈; 炉顶钢圈; 顶圈
wind. 顶环风机
top ring: 24 phrases in 5 subjects
Automobiles8
Electronics1
Metallurgy9
Oil / petroleum2
Technology4