I know that it's hard to devote enough time to class and to social efforts.翻译

I know that it's hard to devote enough time to class and to social efforts.翻译
I know that it's hard to devote enough time to class and to social efforts.翻译

I know that it's hard to devote enough time to class and to social efforts.翻译
我知道同时把时间投放到课堂学习与社会实践中是比较困难的.