分类：教育/科学-外语学习-英语考试
问题：which后面的句子什么成分，修饰哪个的Infactabasic 
In fact a basic amount of movement occurs during sleep which is ecifically concerned with preventing muscle inactivity.
回答：which is specifically concerned with preventing muscle inactivity是定语从句，在这里which指前面整个主句In fact a basic amount of movement occurs during sleep ，可以翻译成“这一点”。全句意思是：事实上，睡眠状态下仍有着基本的活动量，这一点是为了防止肌肉活动停止。