I've read through the same thing twenty times and I've missed something obvious. Someone who's never seen it before looks at and says, did you really mean to do this?

但是它们有一双旁观者之眼,我把同一段代码读上20遍,都会漏掉一些很明显的错误，从没看过这段代码的人会告诉我？

麻省理工公开课 - 计算机科学及编程导论课程节选

and because... you know, never before have we seen this level of interconnectedness

这种水平的互联性是我们之前从未想过的，

关于全球化 - SpeakingMax英语口语达人

What this basically means is, you're given some problem to solve, that you've never seen before.

我们还会再讲讲这些内容,最基本的意思就是你有一个问题要处理。

麻省理工公开课 - 计算机科学及编程导论课程节选

This second chimpanzee is not a relative of the first chimpanzee and they've never seen each other before.

这只黑猩猩跟第一只黑猩猩,没有血缘关系,它们以前也从来没见过面。

耶鲁公开课 - 心理学导论课程节选

I just saw an exposition of them of photos that had never been seen before; but, anyway, this is the Hotel de Ville which is down by Notre Dame, Don't worry about these places.

在一月我看了一个,都是些从未展出过的照片,言归正传,这就是市政厅,南边毗邻巴黎圣母院,不用操心这些地名

耶鲁公开课 - 1871年后的法国课程节选