They have been seen together on two separate occasions.

他们有两次被人看见在一起。

《牛津词典》

He might easily have been seen by someone who lived nearby.

他可能很容易被住在附近的人看到。

《柯林斯英汉双解大词典》

Bigger carps have been seen in Thailand and in France.

在泰国和法国已经见到过更大的鲤鱼。

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Wildlife rescuers in Oregon say some of the birds have been seen around restaurants and cafes.

VOA: special.2010.03.02

Certain kinds of financial markets called "Prediction markets," which may, for example, predict the outcome of an election have been seen to be very accurate predictors, often better than pollsters can manage.

人们称这种金融市场为,"可预测的市场",举个例子来说,市场对某次大选结果的反应,比民调专家,还要更加准确

耶鲁公开课 - 金融市场课程节选

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

Thousands of birds have been seen returning to the islands, despite many succumbing to recent extreme weather.

BBC: Farne Island rangers to carry out 'puffin census'

That is, it might have been seen as the legitimate act of self-defense it is.

CENTERFORSECURITYPOLICY: Agents of influence

The score had not been published and would have been seen only by a few musicians.

ECONOMIST: The perils of letting China dictate the terms of the debate