求翻译：When you return to your studlies,your mind will be refreshed and you'll learn more and study better.First you make a lot of progress and feel happy.Then your language study seems to stay the same.So you will think you'er learning nothing and you may give up.This can last for days or even weeks,yet you needn't give up lf you get enough sleep,food,rest and exercise,studying English is very effective and interesting.是什么意思？

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