dubnium / ˈdub ni əm, ˈdʌb- /

📖毕业后词汇曙光曙光号曙光乍现

dubnium 的定义

n. 名词 noun

Chemistry, Physics.

  1. a superheavy, synthetic, radioactive element with a very short half-life. Symbol: Db; atomic number: 105.