如果你感到很累，先拿出20分钟小睡一会儿再继续学习。

If you are tired take a 20-minute nap first otherwise you are wasting your study time.

youdao

你会由于努力做事、长时间艰辛不懈地努力-像跑一场马拉松、东跑西颠了一天或者因为在家里做清洁、照顾孩子而感到很累。

You get TIRED from exertion, from difficult or long-sustained effort—running a marathon, doing errands all day, managing your home and your kids' lives.

youdao

如果你才开始早起，可能头几天你会感到很累……最后，你不得不在早睡和晚起之间做出选择。

If you begin waking up early, you might be tired for a few days … and eventually, you will be forced either to go to sleep earlier or wake up later. One or the other.

youdao