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。
The instruction fetch is a common operation for each instruction , and consists of reading an instruction from a location in memory.
取指令对于每个指令来说都是个普通操作，它包括从内存单元中读指令。
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