n.d.
abbr. 未注明出版日期（no date）；未注明日期的（not dated）
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n.d.
n. a yellow trivalent metallic element of the rare earth group; occurs in monazite and bastnasite in association with cerium and lanthanum and praseodymium 同义词：neodymiumNdatomic number 60
a state of north central United States bordering on Canada 同义词：North DakotaPeace Garden StateND
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