模态试验边界转换的问题，始终是航空航天界关心的课题之一。

For the problem of the mode test boundary transformation, it has been one of the topics concerned in aviation and spaceflight field all the time.

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平动点轨道在深空探测领域具有重要的应用价值，引起了国内外航天界的密切关注。

Libration point orbits have the important applications in deep space exploration, and have been paid more attentions from all over the world.

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