They were both concerned about the results of their discoveries that led the world into the Nuclear Age.

VOA: special.2009.06.14

So, it was something that parents before 1950 were very concerned about.

所以,在一九五零年之前,脊髓灰质炎是父母们十分担心的一种疾病

耶鲁公开课 - 生物医学工程探索课程节选

Doctor Seuss was very concerned that some children were not learning to read.

VOA: special.2010.05.02

Even before the violence, hotels in Bangkok reported that 20 percent of their reservations were being canceled by travelers concerned by the protests.

VOA: standard.2010.04.12

"we were really concerned because we don't have strong global alliances that the other countries or cities have, so I think that might be one of the reasons we got cut,".

VOA: standard.2009.10.02

"I think they were making a very clear statement that they are concerned about the current state of the economy and that they need to take action now and they're going to pretty dramatic action.

VOA: standard.2009.03.18