There's always, and I think this is nearly invariable -there's an element in Milton's similes that stands outside the framework of the basic comparison.

有一点是时常出现并且几乎不变的,-就是在弥尔顿的明喻中始终有一个元素,是从基本的对比框架中脱颖而出的。

耶鲁公开课 - 弥尔顿课程节选

Advance this pointer-- this finger, to the next element of the list which is 4, make the comparison.

前移这个指示器--也就是这根手指，让它指向列表中的,下一个元素4，再做比较。

哈佛公开课 - 计算机科学课程节选

All of a sudden a third element has been injected in to the comparison.

突然第三个元素又跃入眼帘了。

耶鲁公开课 - 弥尔顿课程节选