许多研究机构投入了大量的精力，但是由于地理等因素的制约，软件仿真成了比部署网络试验更为实际的研究手段。
Many research institutions have invested a lot of energy, but due to geographical constraints and other factors, the simulation software has become a more actual research tools than network deployed.
基于内容的图象数据库检索技术是当今的一个研究热点，国内外许多研究机构都在从事这一课题的研究，并取得了一定的研究成果。
The retrieval technique of content-based image database is a focus of study nowadays, many institutes being engaged in this project have obtained some achievements home and aboard.
基于内容的图像数据库检索技术是当今的一个研究热点，国内外的许多研究机构都在从事这一课题的研究，并取得了一定的研究成果。
The retrieval technique of content-based image database is a focus of query technology studying nowadays, many institutes being engaged in this project have obtained some achievements home and abroad.
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