Clapper has spent several decades in military intelligence.

VOA: standard.2010.06.05

The options have been traded for several decades, starting with the Chicago Board Options Exchange.

期权最初从芝加哥期权交易所进行交易,到现在已经交易了几十年

耶鲁公开课 - 金融市场课程节选

Nuclear power, for example, may be our salvation when we run out of oil--or virtually run out of oil-- it seems to be coming up over the next several decades-- we're going to have to do that, we're going to need nuclear power.

比如说核能,在石油资源枯竭,或快要枯竭的时候,也许再过几十年,这一天就会来临,核能可能成为我们的救世主,那时我们就需要核能源了

耶鲁公开课 - 金融市场课程节选

"If you contrast what is happening in this crisis to what we saw in the last major global crises of the last several decades, I think you are seeing more action now on a broader scale,"

VOA: standard.2009.03.25

It is a mostly African American city that has suffered economic hardship for several decades, a stark contrast to the fame and wealth the Jackson family attained as a result of successful music careers after they left the city.

VOA: standard.2009.07.11

He says increased demand for the fish could solve two problems - getting paid to fish a nuisance out of the river, and returning the populations of native fish to normal levels not seen in several decades.

VOA: standard.2010.07.19

Last year,several scientists had expressed doubt about the possibility of the large Himalayan glaciers melting in a few decades.

VOA: standard.2010.01.23

"We believe that, with the experience of Thailand handling this situation in the past two decades, where at times there were several hundred thousand came over the Thai borders this is,on one hand,serious issue,"

VOA: standard.2009.06.09