“One detail” in Japanese
Short answer
One detail in Japanese is “一斑” (ippan). Full meaning: single part (of a whole), one detail, portion, spot.
Other ways to say “One detail” in Japanese
一点
itten point, dot, speck; one point, one matter, one detail; one point (in a game, exam, etc.), one mark
いってん
itten point, dot, speck; one point, one matter, one detail; one point (in a game, exam, etc.), one mark
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