连接器许可证需要解析每个数据库，软件可能需要在很多远程服务器上安装和维护，以访问必需的数据库。
A connector license is required for each database to be parsed and the software may be required to be installed and maintained on a number of remote servers to access the required databases.
很多学前学校是不需要教师证的。
A teaching certificate or license is not required for many preschools.
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