n.退铅，去铅...

The key to treatment of refractory ores is preoxidation and deleading absorption of carbon on gold.这些方法的关键是预氧化和(或)去除碳质矿的“劫金性”....

deleading的音标：deleading的英式发音音标为：[dɪ'ledɪŋ]deleading的美式发音音标为：[dɪ'ledɪŋ]...