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口径比 / こうけいひ : n 1）aperture ratio (inverse of the f-number) 2）relative aperture
口径 / こうけい : n 1）aperture 2）bore 3）calibre 4）caliber P
口径食 / こうけいしょく : n 1）vignetting
口振り / くちぶり : n 1）way of speaking 2）intimation
口拭き / くちふき : n 1）napkin
口拍子 / くちびょうし : n 1）counting time orally
口抜き / くちぬき : n 1）corkscrew
口縁 / こうえん : n 1 1）rim of bowl or vessel 2 2）peristome
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口径比

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