单词	ferromanganese
释义	ferromanganese noun fer·​ro·​man·​ga·​nese ˌfer-ō-ˈmaŋ-gə-ˌnēz  -ˌnēs : an alloy of iron and manganese containing usually about 80 percent manganese and used in the manufacture of steel Example Sentences Recent Examples on the Web Brazil, for example, filed an application in December 2018 that included the Rio Grande Rise, a deep-ocean mountain range 1500 kilometers southeast of Rio De Janeiro that's covered in cobalt-rich ferromanganese crusts. Richard Kemeny, Science | AAAS, 20 June 2019 Word History First Known Use 1864, in the meaning defined above
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