Translations:System Activity/60/zh-cn

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数据请求数和实际的读入数据并不等价 - 例如如果两个程序读取同一个文件,操作系统不需要从硬盘读取两次 - 系统会读取一次并保存一小段时间。类似的,进程写入文件时,如果另外一个进程也写入同一个文件,之前写入的内容就不需要再写入硬盘了。