In the past,researchers believed that the only cause of C-T-E was a concussion.

VOA: special.2010.09.28

"This material doesn't just reveal abuses, this material describes the past six years of war, every major attack that resulted in someone being detained or someone being killed."

VOA: special.2010.07.31

"The main effect of the Internet on language has been to increase the expressive richness of language, providing the language with a new set of communicative dimensions that haven't existed in the past."

VOA: special.2010.01.28

"As an athlete,you never really look at least I don't I don't look back at the past medals that I've won.

VOA: standard.2010.02.23

And suddenly within the past few days, the Saudis said, "Oh,well,maybe we won't ban BlackBerry use after all."

VOA: standard.2010.08.11

But I hadn't heard any of his songs in the past couple of years." In a nearby outdoor caf, in the scorching heat.

VOA: standard.2009.06.26

"The main effect of the Internet on language has been to increase the expressive richness of language, providing the language with a new set of communicative dimensions that haven't existed in the past,".

VOA: standard.2010.01.16

"There are several problems with this notion of a failed state," "One of them is that somehow in Mexico,all of a sudden, the government has become heavily corrupted by cartels as if there wasn't corruption in the past.

VOA: standard.2009.12.18

"They stress over and over again in domestic propaganda, 'we are not going back to the six party talks.' Now I realize that North Korea has said in the past has said in the past, it ain't coming back, and then it comes back anyway,".

VOA: standard.2009.05.26