[计] multiprocessing operating system

duō chóng chǔ lǐ cāo zuō xì tǒng ㄉㄨㄛ ㄔㄨㄥˊ ㄔㄨˇ ㄌㄧˇ ㄘㄠ ㄗㄨㄛ ㄒㄧˋ ㄊㄨㄥˇ