| 单词 | principal ray |
| 释义 | Definition of principal ray in English:principal raynoun
OriginEarly 18th century; earliest use found in John Harris (c1666–1719), writer and lecturer on science. Definition of principal ray in US English:principal raynoun
OriginEarly 18th century; earliest use found in John Harris (c1666–1719), writer and lecturer on science. |
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