修改hosts文件用来观看coursera视频

52.84.246.90 d3c33hcgiwev3.cloudfront.net

52.84.246.252 d3c33hcgiwev3.cloudfront.net

52.84.246.144 d3c33hcgiwev3.cloudfront.net

52.84.246.72 d3c33hcgiwev3.cloudfront.net

52.84.246.106 d3c33hcgiwev3.cloudfront.net

52.84.246.135 d3c33hcgiwev3.cloudfront.net

52.84.246.114 d3c33hcgiwev3.cloudfront.net

52.84.246.90 d3c33hcgiwev3.cloudfront.net

52.84.246.227 d3c33hcgiwev3.cloudfront.net