词汇	two tone system
释义	two tone system 双音系统
随便看	ferrous and nonferrous screw and nut ferrous and non-ferrous screw and nut ferrous arsenate ferrous arsenide ferrous ascorbate Ferrous Aspartate Ferrous-Base ferrous bicarbonate ferrous biooxidation ferrous bromide ferrous calcium citrate ferrous carbide ferrous-carbide Ferrous carbinate ferrous carbonate ferrous carbonate and aloin tablets ferrous carbonate mass ferrous carbonate pills Ferrous Carbonate Saccharated ferrous carbonate synthesis ferrous castings ferrous charges consumption ferrous chelate ferrous chloride ferrous chromite