Only two percent were serious.

VOA: special.2009.08.06

People did say they were happy to have participated and only 2% said that they were sorry, but still serious damage could have been done and perhaps was done.

但确实有人说他们很高兴能参与实验,只有2%的人说他们感到难过，但这个实验可能对电击者造成严重的伤害,也许已经造成了。

耶鲁公开课 - 心理学导论课程节选

The United States says it will never accept North Korea's nuclear weapons, and that normal diplomatic ties will only follow serious steps by Pyongyang to fulfill its disarmament pledges.

VOA: standard.2009.10.23

The Iranian diplomat told delegates that illicit drugs represent a serious peril to the security and stability of not only Afghanistan, but the entire region,adding that no country can fight the phenomenon alone.

VOA: standard.2009.03.27