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"improve the physical fitness of classmates" 可以用英语表达为 "enhance the physical condition of classmates"。

来源："improve" 是动词，意思是提高、增强。"Physical fitness" 是名词，意思是身体素质。

一些英文例句及其中文翻译：

The school organized an event to enhance the physical condition of students. (学校组织了一个活动来提高学生的身体素质。)
The coach is dedicated to improving the physical fitness of his team. (教练致力于提高他的团队的身体素质。)
The school has a program to enhance the physical condition of its students. (学校有一个计划来提高学生们的身体素质。)

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