user library function 用户自定义库函数
This usually means copying the arguments over from the spe local store, running the respective library function in the user thread, and continuing by calling the ioctl again.
这通常意味着从SPE的本地存储中拷贝参数，在用户线程中运行各自的库函数，并通过再次调用ioctl继续执行。
This namespace declaration is required for any application that USES the library since the user-defined function has to be in a certain namespace.
任何使用该库的应用程序都需要这个名称空间声明，因为用户定义的函数必须存在某个名称空间中。
User information literacy education is an important function of university library.
用户信息素养教育是高校图书馆的重要职责。
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