英语翻译I studied in.middle school in the past three years.这句话有没

这句话没问题
As for English learning,it's desirable to strike a balance between study and rest.Only in this way will it be benificial to personal development.
(it 指代to strike a balance between study and rest）

Only hard work interchanging with rest can be more advantageous to the development of individuals.
下面那句话没问题的哈