occasional fluctuations
definitions
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Intermittent or irregular changes in amount, level, value, or condition that occur from time to time rather than continuously or predictably.fr: Fluctuations occasionnelles
examples
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The laboratory equipment recorded occasional fluctuations in temperature despite the controlled environment.
L'équipement de laboratoire a enregistré des fluctuations occasionnelles de température malgré l'environnement contrôlé.