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usage
A modern set phrase (not a classical chengyu) built on the AB+CD pattern: 准确 (accurate) + 无误 (without error). It functions like an adverbial or predicate complement praising the precision of work — translation, calculations, reports, recall.
memory
Two synonymous halves reinforcing each other: 'accurate' and 'no errors' say the same thing twice for emphasis. This A+A redundancy is a common Chinese rhetorical device for total certainty.
