They have worked on space gardening for many years.

他们从事太空园艺已有多年。

youdao

They have worked with cows since they were children.

他们从小就和牛打交道。

youdao

They have worked for tree hours this morning.

他们今早工作了三个小时。

youdao

At Penn State,for example, adviser Pat Coleman says they have worked with local banks to make banking easier for international students.

VOA: special.2009.05.28

So, the way it has worked out in practice is that companies, when they have a major announcement to make, they have some kind of web event.

因此,现实中上市公司的做法就是,当公司需要对外公布一条重大消息时,会利用互联网这个渠道

耶鲁公开课 - 金融市场课程节选

They had to give some of them the real vaccine and some of them a placebo vaccine in order that they could really tell if the vaccine worked; you have to have it placebo controlled.

研究者们还须给部分孩子接种真正的疫苗,给另外一些孩子接种空白疫苗,以分辨疫苗是否真的有效,所以你必须使用安慰剂作对照

耶鲁公开课 - 生物医学工程探索课程节选

They have worked out how to squeeze oil from the tar sands of Alberta.

WSJ: Big Oil Companies Are Shifting Their Focus Back to the West

They have worked too hard, they have sacrificed too much for a patronizing pat on the back.

CNN: Graham: McCain ... stopped Congress from losing this war

In 2011, he says they have worked with more 1, 500 customers to make sure software meets their requirements.

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