U.S.envoy Stephen Bosworth in Seoul Thursday said he had "very useful" meetings with senior North Korean officials this week.

VOA: standard.2009.12.11

But real useful things that let me have a deep appreciation for the side I wish I had done more.

但是真正有用的是让我有了正确的见解,这是我希望能够学到更多的。

斯坦福公开课 - 微软CEO-Steve.Ballmer谈科技的未来课程节选

"We have had very useful conversations here with our South Korean partners,"

VOA: standard.2009.09.06