It has been done by a scientific experiment.

这是科学实验的的结果。

youdao

It has been done in the past.

过去已经做到了。

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But it has been done before.

不过，此前已有人这样做了。

youdao

For example, like it has done recently if you've been following it earlier this year.

举个例子,如果你们今年关注股票市场的话,会发现今年年初的股票运动趋势非常戏剧化

耶鲁公开课 - 金融市场课程节选

because it will give you an opportunity to say "I want to be sure that this is done, has been done"

因为用这个句型，你就能表达“我想确认这事会做到的，或者已经做到了。”

Make sure 课堂 - SpeakingMax英语口语达人

For all I could tell, people did equally well but this experiment has been done tens of thousands of times and you could do it yourself on a computer screen.

据我所听到的，两次都差不多,但这个实验做过几十万次,你们可以在电脑上做。

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It has been done as part of a wider project to make the area more attractive to businesses.

BBC: Middlesbrough installation brings to life roundabout

"It has been done in a way that it is homegrown process, because the reforms are from within the countries, " he said.

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And it has been done with Denizen (not to be confused with the jeans line, though I bet they would make a helluva pairing).

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