Isaiah in this passage is describing a crucial moment in his career, his career as a prophet: the moment in which his lips are cleansed and he is empowered -- divinely empowered -- to speak prophetically.

在这一段里艾赛亚描述了一个他事业上至关重要的时刻，作为一个预言家：在这个时刻他的嘴唇被清洁干净,他被神圣得授权来预言。

耶鲁公开课 - 弥尔顿课程节选

The iniquity of his lips must be burned off by a live angelic coal, that the sinfulness of his lips we could think of it as the sinfulness of his voice, his poetic voice -- will have to be purged.

他邪恶的嘴唇必定会被天国燃烧的煤块烧掉，他的嘴唇的罪孽,我们可以认为是他所说的话的罪孽，他的诗句必将被净化。

耶鲁公开课 - 弥尔顿课程节选

In alluding to the prophet Isaiah in the prelude, Milton suggested that the iniquity of his lips had to be purged off -- burned off, with the live coal supplied by one of the seraphim.

弥尔顿在序曲中提到预言家艾赛亚，就是要表示他唇齿的邪恶,应该被净化，被其中一个，六翼天使用炭火烧掉。

耶鲁公开课 - 弥尔顿课程节选

Now we've been charting for a couple of weeks now Milton's long-standing project to purge his lips of secular interests and to cleanse his literary consciousness of the tempting influence of secular literary voices, and one of those voices is obviously Shakespeare's.

现在我们已经讨论了几个星期了,弥尔顿长期坚持的项目像净化世俗利益,净化世俗的文学看法的影响,对他文学意识诱惑，其中有一个看法显然是莎士比亚的。

耶鲁公开课 - 弥尔顿课程节选