That is to say, a lot of problems concerning semantic processing theory and technology of CBVR need a further study.
进一步说，目前基于内容的视频检索的语义处理理论和技术仍有大量问题有待深入研究。
The composition and microstructure characteristics, processing theory and technology, properties and strengthen mechanism of this kind of materials were reviewed.
对快速凝固过共晶铝硅合金材料的成分、组织结构特点，制备理论及工艺，性能及其强化机理进行了综合评述。
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