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https://blog.stranity.com.tw/2017/03/27/r-%e8%bf%b4%e5%9c%88%e7%9a%84%e5%b9%b3%e8%a1%8c%e9%81%8b%e7%ae%97-dosnowforeach/
R 迴圈的平行運算 doSNOW+foreach