目录操作包括把新数据保存到目录，搜索和检索保存的数据，删除不需要的数据，更新过时数据，以及类似的操作。

Directory operations include storing new data in a directory, searching for and retrieving stored data, deleting unwanted data, updating obsolete data, and similar operations.

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下面是我们的想法：在服务器中保存联系人，而所有添加和删除之类的操作都通过Ajax调用完成。

Here is the idea: We will keep our contacts on the server, and all of our operations like add and delete will be Ajax calls.

youdao

该保护防止用户删除重要文件和应用程序，在桌面上擅自更改，保存或使用未经授权的程序和损害操作系统。

NetSupport Protect prevents users from deleting critical files and applications, making unauthorized changes to the desktop, saving or using unauthorized programs and harming the operating system.

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