A document should be indexed more generally first by descriptors, such as coordinate indexing, hypernym indexing and proximate indexing; then by free term specially, namely double indexings.
一篇文献必须先用正式主题词作较泛指的组配标引、上位词标引、靠词标引，再用自由词作较专指的标引，即作双重标引。
This paper proposes double action parallel indexing CAM mechanism, and studies cams profile by methods used in gear meshing.
提出了双作用式平行分度凸轮机构，并按研究齿轮啮合的方法研究其凸轮廓线。
The speed-ratio curve of double-action parallel indexing cam mechanism has special property in shape, which makes it is not available from present transmission function, but designed purposely.
双作用式平行分度凸轮机构对速比曲线的几何形态有特殊要求，这使得该机构的速比不能从同类机构现有运动规律中得到，而必须经过特殊设计。
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