The ability to prevent and treat AIDS has advanced beyond what many might have hoped over two decades ago.

如今人们预防和治疗艾滋病的能力已经超过了二十多年前许多人的期望。

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Over two decades 137 sets of twins eventually visited Thomas Bouchard's lab in what became known as the Minnesota Study of Twins Reared Apart.

在20多年的时间里，最终有137对双胞胎拜访了托马斯·布沙尔的实验室，这就是后来著名的“明尼苏达双胞胎实验”。

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The New Zealand Ministry of Health has found from research carried out over two decades that 6-10% of children in that country are affected by hearing loss.

新西兰卫生部经过20多年的研究发现，该国有6-10%的儿童受到丧失听力的影响。

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Aravind Eye Hospital has conducted mobile eye camps in villages across Tamil Nadu over the past two decades.

VOA: standard.2010.05.25

We've gotten, over the last two decades in particular, very sophisticated about taking pictures inside the body allowing doctors to look inside the body and predict things about our internal physiology that they couldn't predict just by looking at us or putting their hands on us.

特别是在近二十年当中,我们对体内造影已经十分熟悉,它使医生能够看到身体内部,并预测我们体内的生理变化,而仅仅是通过,视诊或者触诊是不能预测这些变化的

耶鲁公开课 - 生物医学工程探索课程节选

His research began with fruit flies, but over the last two decades, his focus has been on parasitic protozoa, single-celled organisms that cause major diseases.

VOA: standard.2010.04.05

Klein embezzled the money over two decades to fund a gambling debt, the court heard.

BBC: Norfolk stamp collector repays debt over church thefts

Over two decades, researchers have seen increased use of calcium, vitamin D and folic acid.

CNN: Half of Americans use supplements

The following year, cigarette sales declined for the first time in over two decades.

CNN: A brief history of tobacco