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https://raymondong.co/2018/03/20/%e7%ac%ac%e4%b8%80%e6%98%af%e6%97%b6%e9%97%b4-%e7%ac%ac%e4%ba%8c%e6%98%af%e7%a9%ba%e9%97%b4/
第一是时间 第二是空间