It's a provisional ending. It's not a rhyme word, and so it doesn't constitute the end of a unit of sense as a rhyme word would in most heroic couplets.

它不是真的结尾，不是韵脚，因此它不像大部分英雄双韵体中的韵脚词一样,标志着一个意思表达的完结。

耶鲁公开课 - 弥尔顿课程节选

He addresses instead the English language: "Hail native Language," Milton begins, and then he proceeds to set out in his heroic couplets of iambic pentameter a map for his future career as a famous poet.

反而写了英语这门语言：,开头写道，“为本土语言欢呼吧“,然后继续写他的五音部短长格对句,这是著名诗人对未来事业的规划。

耶鲁公开课 - 弥尔顿课程节选

Those are plays though, and all English narrative poems, including all of Shakespeare's narrative poems, they had all been written in rhyme, either long verse paragraphs of rhymed heroic couplets or in intricately rhymed stanzas.

但那些是戏剧，所有的英语叙事诗，包括所有莎士比亚的叙事诗，都是押韵的，不管是英雄双韵体的大段诗篇,还是精巧押韵的诗节。

耶鲁公开课 - 弥尔顿课程节选