dilapidate

Second, they may indulge in it, thus dilapidate their study, which isn't rare.

其次，他们会沉迷其中以致荒废了学习，这是不罕见。

I hope we could arrange our time properly/make good use of our time, that is not only to let network games enrich our time after school but also not to dilapidate our study and waste time.

我希望我们能够合理安排时间,使网络游戏既能够丰富我们的课余生活,又能够不使我们荒废学业,浪费时间.

dilapidate

v. (使)荒废, (使)毁坏