amnesia - 健忘症 这个单词还比较难记。如果想说一个人健忘，可以说他"forgetful"。

You're so forgetful. - 你真健忘。

Selective amnesia - 选择性失忆

看电视也经常看到有人的了选择性失忆症。选择性失忆症的患者通常是受了刺激，把一些特别痛苦的记忆从脑海里删除。 可以两个英文短语来表达把不愉快的记忆从脑海里删除的意思： block sth. out/erase the memory of

block sth. out: to stop yourself thinking about something or remembering it:
a memory so terrible that she tried to block it out

She had tried to erase the memory of that day.

a temporary loss of memory - 暂时失忆

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