One of these little details that Milton has lifted rather directly is that of the river Lethe, the river of oblivion that was believed to flow in the underworld.

其中弥尔顿直接盗用的一个小细节,是遗忘之河，即忘川,忘川被认为在地狱流淌。

耶鲁公开课 - 弥尔顿课程节选

It's a fantasy, of course, because no such brainwashing is going to be possible, just as the fallen angels - if you look at line 607 - will be barred from drinking their fill of the river Lethe, forgetfulness is impossible.

当然这是一次幻想，因为这种洗脑,根本就不可能实现，就如同那些堕落天使一般,如果看第607行7,他们被禁止喝忘川之水，遗忘是不可能的。

耶鲁公开课 - 弥尔顿课程节选