| 词汇 | obscure rays |
| 释义 | Definition of obscure rays in English:obscure raysnoun
OriginMid 19th century; earliest use found in Mary Somerville (1780–1872), science writer and mathematics expositor. Definition of obscure rays in US English:obscure raysnoun
OriginMid 19th century; earliest use found in Mary Somerville (1780–1872), science writer and mathematics expositor. |
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