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

To survive in New York City, the most important thing is to watch your back always.

生存在纽约这个城市，最重要的事情就是时刻保持小心。

生存英语 - SpeakingMax英语口语达人