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Update 计算机操作系统.md

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@ -46,7 +46,7 @@
并发是指宏观上在一段时间内能同时运行多个程序，而并行则指同一时刻能运行多个指令。
并行需要硬件支持，如多流水线或者多处理器。
并行需要硬件支持，如多流水线、多核处理器或则分布式计算系统。
操作系统通过引入进程和线程，使得程序能够并发运行。