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secondary recovery ['sekənd(ə)rɪrɪ'kʌv(ə)rɪ]
coal. 二次开〔回〕采
oil 二次开采
tech. 二次回收; 二次回采
secondary recovery: 16 phrases in 6 subjects
Chemistry1
Electronics1
International trade1
Mining3
Oil / petroleum9
Technology1