久青草国产手机视频免费观看_毛片网站是多少_亚洲视频中文_一区二区高清在线

首頁英語詞典manganesemanganese英英釋意

manganese

英 ['m??g?ni?z] 美[,m??ɡ?'niz]
  • n. [化學] 錳

英英釋意

1. a hard brittle gray polyvalent metallic element that resembles iron but is not magnetic; used in making steel; occurs in many minerals