It's a scheme that in English counts accents or stresses per line and then arranges them in a pattern.

这种体系里的英文诗每行都有重读,然后将他们按一定模式排列。

耶鲁公开课 - 现代诗歌课程节选

This is the English translation because the poem is in Latin: Because you loved the blush of modesty and a stainless youth and because you did not taste the delight of the marriage-bed, lo! the rewards of virginity are reserved for you.

诗是用拉丁文写的，这是英文翻译：,诗歌大意：，你爱羞怯的脸红和无瑕的青春,未品尝过婚床上的欢愉，瞧！，你将因这贞洁获得奖赏。

耶鲁公开课 - 弥尔顿课程节选