转载：https://allen-feng.github.io/2019/04/24/190424_Google-Cloud-Platform%E5%85%8D%E8%B4%B9%E7%94%B3%E8%AF%B7-%E4%B8%80%E9%94%AE%E6%90%AD%E5%BB%BASSR-BBR%E5%8A%A0%E9%80%9F/