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.zh: 巨大的进步
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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.zh: 重大改进
examples
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There has been a great improvement in his test scores this semester.
这个学期他的考试成绩有了巨大的进步。
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The new software update represents a great improvement to the system's security.
新的软件更新代表了系统安全性的重大改进。