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单词
emission nebula
释义
WordReference Random House Unabridged Dictionary of American English © 2024
emis
′
sion neb′ula,
[
Astron.
]
Astronomy
a bright diffuse nebula that emits light as a result of ionization of its gas atoms by ultraviolet radiation, as the Orion Nebula, planetary nebulae, and supernova remnants, as the Crab Nebula.
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更新时间:2025/11/11 23:18:22