Yet Mark Uhran, assistant associate administrator for the ISS, refutes the criticism that the station hasn't done any useful research.

然而，国际空间站副主任助理马克·乌兰反驳了关于国际空间站没有做出有用研究的批评观点。

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Once separation occurs, that?s really the end of the launch trajectory,? said Doug Cooke, associate administrator of NASA?s exploration program.

“一旦分离，实际上发射轨迹已经结束，”Doug Cooke说道, 他是NASA探测计划的副署长。

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Planetary scientist Alan Stern, former NASA associate administrator for science, said it is a "very clever new idea," but one that is not easily tested to learn whether it is right.

行星研究学家艾伦·斯坦，NASA前科研协理署长，称新理论“十分新颖独特，”但不容易证明其正确性。

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He served as associate administrator in the U.S. Department of Transportation in the 1970s.

WSJ: Which Gets Priority: High-Speed Rail or Intercity Passenger Service?

But safety is also key, advised George Nield, Associate Administrator for Commercial Space Transportation at the Federal Aviation Administration.

MSN: Suborbital spaceships spark scientific frenzy

Stern also chairs the Commercial Spaceflight Federation's Suborbital Applications Researchers Group and is a former NASA associate administrator for science.

MSN: Suborbital spaceships spark scientific frenzy