这个男孩对此事的记忆有缺失，他对有些事情不记得了。
The boy has gaps in his mind about it. He is blotting certain things out.
细节的缺失常常出现在梦境中，而这正是记忆的特征。
The lack of detail that is characteristic of memory occurs also in dream visions.
痴呆症患者早期最明显的一个症状就是认知记忆的缺失。
The loss of recognition memory is a main symptom of early Alzheimer's disease.
痴呆症患者早期最明显的一个症状就是认知记忆的缺失。
The loss of recognition memory is a main symptom of early Alzheimer's disease.
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