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nebulium
释义
WordReference Random House Unabridged Dictionary of American English © 2024
ne•bu•li•um
(nə byo̅o̅
′
lē əm),
USA pronunciation
n.
[
Astron.
]
Astronomy
a hypothetical element once thought to be present in emission nebulae because of certain unidentified spectral lines, now known to be forbidden transitions of oxygen and nitrogen ions.
nebul
(
a
) + -
ium
1895–1900
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更新时间:2025/7/23 18:50:17