great improvement
definitions
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A significant and noticeable advancement, enhancement, or positive change in the quality, condition, skill, or performance of someone or something.es: Gran mejora
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A substantial upgrade or physical enhancement made to a structure, system, or object to make it more efficient, functional, or better performing.es: Mejora sustancial
examples
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There has been a great improvement in his test scores this semester.
Ha habido una gran mejora en sus calificaciones este semestre.
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The new software update represents a great improvement to the system's security.
La nueva actualización de software representa una gran mejora en la seguridad del sistema.