| 单词 | principal focus |
| 释义 | Definition of principal focus in English:principal focusnoun Optics
OriginLate 17th century; earliest use found in Isaac Newton (1642–1727), natural philosopher and mathematician. Definition of principal focus in US English:principal focusnoun Optics
OriginLate 17th century; earliest use found in Isaac Newton (1642–1727), natural philosopher and mathematician. |
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