问题描述：
请问这句英语中的in which代指什么?
dementia is a serious illness affecting someone's brain and memory in which they gradually stop being able to think or behave in a normal way.Most forms of dementia usually affect only old people.
dementia is a serious illness affecting someone's brain and memory in which they gradually stop being able to think or behave in a normal way.Most forms of dementia usually affect only old people.
问题解答：
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