Since the early 1990s, several clinics have been established in the US.

自20世纪90年代初以来，美国已经建立了几家诊所。

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Since the early 1990s, several clinics have been established in the U. S. to treat heavy Internet users.

1990年代初以来，美国已建立了一些诊所来治疗重度依赖互联网的用户。

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To date, no adverse health effects have been established for mobile phone use.

迄今为止，尚未证实移动电话的使用对健康造成任何不良后果。

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But there has been growing criticism, particularly from congressional Republicans, that Mr.Obama should have established a plan for what to do with the detainees at Guantanamo before announcing his decision to close the facility by January 2010.

VOA: standard.2009.05.20

Now potentially to some of the other things as well, but these are the main ones, and these links have been very clearly established.

同时它还和其他一些疾病存在潜在关系,但主要就是这几项,并且关系十分明确

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Quarantined populations have been established but efforts to find a cure have been depressingly fruitless.

BBC: Watching Australia's wildlife

Now several have been established, with a presence in most of the country's major cities.

BBC: The angels helping Indian start-ups spread their wings

To date, no adverse health effects have been established as being caused by mobile phone use.

CNN: STORY HIGHLIGHTS