They don't want him to go out. He's been in jail for more than 20 years now and the maximum rule is to keep him inside a cell.

VOA: standard.2010.07.07

More than just a little. -More than just a little 20% Federal spending is now about 20 percent of GDP ? three years from now, higher, lower or about the same?

不只低一点，-好吧,目前，联邦财政支出占GDP的,3年后，这个比例会升高，降低，还是持平？

斯坦福公开课 - 经济学课程节选

One of those scientists. Kim Cecil,from the University of Cincinnati She was part of a team of researchers who took annual blood samples from several hundred lead-exposed children for more than 20 years.

VOA: standard.2009.12.19

This is better than that". The Indian government plans to set up 20,000 more rural vision centers in the coming years.

VOA: standard.2010.05.25

Mayo Clinic researcher Gabriel Thabut. and his colleagues reviewed 20 years of records from more than 15,000 transplants.

VOA: standard.2010.07.14

He says before the rains failed more than two years ago, he had 400 goats and 20 camels.

VOA: standard.2009.10.06

There are 20 sports this year, three more than were played four years ago.

VOA: standard.2009.09.10