彼(かれ)等(ら) kareraは wa細(こま)か()い() komakai差(さ)異(い) saiに ni気(き)が()つ()か()な()か()っ()た() kigatsukanakatta。 They didn't notice the subtle differences. Literal They [topic-は] fine differences [to-に] didn't-notice. 細かい差異 means 'subtle/fine differences.' 気がつかなかった means 'didn't notice' — 気がつく is the standard expression for noticing. daily lifeobservation
彼(かれ)等(ら) kareraは wa細(こま)か()い() komakai差(さ)異(い) saiに ni気(き)が()つ()か()な()か()っ()た() kigatsukanakatta。 They didn't notice the subtle differences. Literal They [topic-は] fine differences [to-に] didn't-notice. 細かい差異 means 'subtle/fine differences.' 気がつかなかった means 'didn't notice' — 気がつく is the standard expression for noticing. daily lifeobservation