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完全数
noun
(number theory) perfect number, a positive integer that is equal to the sum of its positive divisors, excluding the number itself
彼は誰時
noun
Synonym of 黄昏 (tasogare, “dusk; twilight”) / Synonym of 黄昏時 (tasogaredoki, “dusk; twilight”)
完全五度
noun
(music) perfect fifth (interval between the first and second overtones or of seven semitones)
遠くの親類より近くの他人
proverb
Literally, "Neighbors nearby over family far away." People often rely more on unrelated people close to them rather than family who are living far away, in particular during times of disaster.
彼を知り己を知れば百戦殆からず
phrase
(literally) know the other side and yourself, a hundred battles will not be perilous