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   English ⇄
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niton ['naɪtɔn] n
gen. 氡 (Em²² 射气同位素); 镭射气第86号元素
earth.sc. 氨射气同位素 Em²²²; 镭射气
met. 氡 (Rn (旧用 Nt))
plast. 氡
space 氨 (86号元素，符号 Rn)
 English thesaurus
niton ['naɪtɔn] abbr.
abbr. Rn

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