participate 和 study 要变成动名词,participating和studying.另外,参加活动是participate in.
如果是我,可能会这样写：Participating in university activities or studying acadamic knowledge, either of which is good for our career in the future.
或者如果你想表达参加活动和学习都是有利的意思,试试看both?
Both participating in university activities and studying acadamic knowledge are good for our career in the future.
Hope this would be helpful to you. =D