Special system calls, or requests to the UNIX kernel, allocate and free the memory and set permissions; common read and write operations put and get data from the region.
用特殊的系统调用(即对UNIX内核的请求)分配和释放内存并设置权限；通过一般的读写操作读写内存段中的数据。
The XOM document object model protects users from common mistakes in the use of XML, while offering good performance and memory-efficiency.
The XOM文档对象模型可以防止用户在使用XML时出现的常见错误，同时提供了良好的性能和高效的内存使用。
If it's a fairly common graphics card and you can't find the chipset or memory, you should be able to select a generic or older version of the card from the X installation database.
如果它是一个非常共同的图形卡，而且你不能找晶片组或者存储器，你应该能够选择来自X安装数据库的卡的一个一般性或比较旧版本。
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