| 词汇 | actinic focus |
| 释义 | Definition of actinic focus in English:actinic focusnoun Optics Photography rare
OriginMid 19th century; earliest use found in Art-union. Definition of actinic focus in US English:actinic focusnoun Optics Photography rare
OriginMid 19th century; earliest use found in Art-union. |
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