PING yuyuan.org (18.239.18.92) 56(84) bytes of data.
64 bytes from server-18-239-18-92.ams58.r.cloudfront.net (18.239.18.92): icmp_seq=1
ttl=251 time=4.61 ms
64 bytes from server-18-239-18-92.ams58.r.cloudfront.net (18.239.18.92): icmp_seq=2
ttl=251 time=3.99 ms
64 bytes from server-18-239-18-92.ams58.r.cloudfront.net (18.239.18.92): icmp_seq=3
ttl=251 time=3.92 ms

--- yuyuan.org ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1999ms
rtt min/avg/max/mdev = 3.926/4.179/4.613/0.312 ms