remarkable achievement
definitions
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An extraordinary accomplishment or feat that is worthy of notice, admiration, or praise due to its difficulty, scale, or quality.fr: Accomplissement remarquable
examples
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The rebuilding of the capital was completed within three years, a remarkable achievement that demonstrated the efficiency and dedication of the administration.
La reconstruction de la capitale a été achevée en trois ans, un accomplissement remarquable qui a démontré l'efficacité et le dévouement de l'administration.