A lot of users request high quality service, and the server needs higher performance and efficiency. All these bring new technical issues into video applications.
用户需要更高质量的服务，服务器需要更高的性能和效率，所有这些都给视频应用带来新的技术问题。
Commerce database has certain limitation, while self - built database request high technical ability which is beyond the ability of specialized librarians.
购买商业数据库存在一定的局限性，而自建数据库仅依索图书馆专业人员也不易建设出高质量的数据库。
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