This algorithm type is quite common in search databases and other reference applications.

在搜索数据库和其他参考应用程序里，这种算法类型相当普遍。

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Each type has its own characteristic features, but there are certain laws of development which are common to both and deserve our study and use for reference.

这两种课程模式各有特点，但也有其共性规律及发展趋势，值得研究探讨和借鉴。

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