"学习会变差" 用英文可以表示为 "learning will deteriorate"。
其中，"deteriorate" 是一个动词，意思是 "to become worse or of lower quapty"，即 "变得更差或质量更低"。例如：
His health has been deteriorating for the past few months. (他的健康在过去几个月里一直在恶化。)
The economy is deteriorating rapidly. (经济正在迅速恶化。)
下面是一些关于 "learning will deteriorate" 的英文例句，以及它们的中文翻译：
If you don't study regularly, your learning will deteriorate. (如果你不定期学习，你的学习会变差。)
If you don't get enough sleep, your learning will deteriorate. (如果你睡眠不足，你的学习会变差。)
If you don't pay attention in class, your learning will deteriorate. (如果你在课堂上不注意，你的学习会变差。)