Ant societies existed in something like their present form more than seventy million years ago.

蚂蚁社会大约在七千万年前就以类似现在的形式存在。

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In choosing a method for determining climatic conditions that existed in the past, paleoclimatologists invoke four principal criteria.

在选择确定过去存在的气候条件的方法时，古气候学家援引了四个主要标准。

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The idea already existed in embryo in his earlier novels.

这个想法在他早期的小说中已初见端倪。

《牛津词典》

This raises the exciting possibility that life may have existed in the past on Mars.

VOA: special.2009.12.30

None of us have seen a case of smallpox, it hasn't existed in the world for many decades now.

我们没人见过天花,在这个世界上它已经被消灭几十年了

耶鲁公开课 - 生物医学工程探索课程节选

What I'm suggesting to you is that this was the best information gathering and storing device that existed in the Mediterranean world.

我所想要告诉你们的是,特尔斐是地中海世界,收集和储存信息的最佳地点

耶鲁公开课 - 古希腊历史简介课程节选

Dr. Urbina and her colleagues wondered whether a similar correlation existed in children and young people.

WSJ: Heart-Attack Risk Starts Younger

But Mr Hennighan said problems existed in the town before the supermarket giant made its decision.

BBC: Machynlleth: Campaign to rejuvenate 'rundown' town

What was striking is the overlap that existed in a lot of these sessions.

WHITEHOUSE: President Obama Closes Forum on Jobs and Economic Growth