I was sorry not to have seen them.

我很遗憾没有见到他们。

《牛津词典》

"Somebody would have seen her."—"I doubt it, not on Monday."

“有人可能见过她。”—“我不信，不可能在星期一。”

《柯林斯英汉双解大词典》

You should have seen it!

你应该看见的！

《牛津词典》

"That's why we need strong rules of the road to guard against the kind of systemic risks we have seen.

VOA: special.2009.09.18

So, more data to come, so this is a clip some of you might have seen in section already.

随着更多数据的出现，就会形成一个标签,有些人可能已在相应章节中看到过了。

哈佛公开课 - 计算机科学课程节选

Listen, I have seen this person's work in these eight context and it's all been great. You know.

他说，我曾经见过这个人在八种环境下工作，而且工作质量都很高。

写推荐书的人 - SpeakingMax英语口语达人

Some experiments claim to have seen signals of dark matter in the form of annual modulation.

BBC: Dark Matter: Experiment to shed light on dark particles

We have seen promising positive commitments from the African Union and African leaders on the issue.

CNN: Is this the beginning of the end of child marriage?

Venture folks have seen a market across the board turn sour on them before.

FORBES: Venture Vetting