| 单词 | principal section |
| 释义 | Definition of principal section in English:principal sectionnoun
OriginEarly 19th century; earliest use found in John Herschel (1792–1871), mathematician and astronomer. Definition of principal section in US English:principal sectionnoun
OriginEarly 19th century; earliest use found in John Herschel (1792–1871), mathematician and astronomer. |
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