内存映射文件是把一块内存连接到一个文件的操作系统特性。
Memory-mapped files are an operating system feature that links a block of memory to a file.
HTML5能让你访问到底层的操作系统特性(地理位置，本地存储等等)。
HTML5 gives you access to many low-level OS features (geo-location, local storage... etc).
同时，托管代码以本机语言执行，访问并享受丰富的操作系统特性。
Meanwhile, managed code executes in native machine language and enjoys rich access to OS features.
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