问题是这些测试必须由受过训练的神经心理学家进行，需要一个多小时时间完成；此外，许多有温和认知损伤的人并不会出现痴呆。
The problem is that the tests must be administered by a trained neuropsychologist and take more than an hour to complete; moreover, many people with mild cognitive impairment do not progress to dementia.