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Especially, the author researches the coupling libration of water and dam detailedly.
特别对库水与坝体耦合振动问题进行了详细的阐述.
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Owing to the phenomenon of libration it is possible to observe up to 60% of the total lunar surface.
由于天平动的现象，我们可能观测到月球总面积的60%。
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Study on Frequency Characteristics of Libration in Aerostatics Radial Bearing
晶体管的频率特性气体静压轴颈轴承振动频率特性研究
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