I should have detested you if I had seen you before I saw the robin and Dickon.

如果我在看到知更鸟和狄肯之前就看到你，我会讨厌你的。

youdao

I feel as if I have seen you before.

我好像觉得在此之前就见过你。

youdao

"Had you seen the car before?"—"Oh yes, it was always in the driveway."

“你以前见过这辆车吗？” — “哦，见过。它总在车道上。”

《柯林斯英汉双解大词典》

"I think he has seen you before.

VOA: special.2009.05.23

Up on the screen, I've got-- I commented it out, but I've got a piece of code that you've seen before, right up here. OK?

我现在在大屏幕上标出来的,是你们以前看过的一段代码,就在这儿？

麻省理工公开课 - 计算机科学及编程导论课程节选

And these shapes of p orbitals probably do look familiar to you, most of you, I'm sure, have seen some sort of picture of p orbitals before.

这些ｐ轨道的形状你们可以能已经很熟悉了，我相信大部分人，都看过ｐ轨道的图片。

麻省理工公开课 - 化学原理课程节选

Of course, many other products were things you've seen before, if you're an Apple fan.

FORBES: The Mac That Fell To Earth

There are few greater thrills, especially in your dotage, than spotting a bird you've never seen before, the effort you put into remembering its plumage and behavior, and then consulting your birding guide and being able positively to identify it.

WSJ: Park Filmmakers Wing It

Many of the dishes are things you will never have seen before, even if you love Thai food, and they offer a 5-course tasting menu where you pick one dish from each category (curry, salad, soup, etc.) for a full-blown Thai flavor experience, one that can be expertly paired with wines.

FORBES: Nahm, London, UK