PING underground-www.shihui658.icoc.cc (172.67.159.193) 56(84) bytes of data.
64 bytes from 172.67.159.193 (172.67.159.193): icmp_seq=1 ttl=60 time=5.40 ms
64 bytes from 172.67.159.193 (172.67.159.193): icmp_seq=2 ttl=60 time=5.11 ms
64 bytes from 172.67.159.193 (172.67.159.193): icmp_seq=3 ttl=60 time=5.09 ms

--- underground-www.shihui658.icoc.cc ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2004ms
rtt min/avg/max/mdev = 5.093/5.204/5.406/0.143 ms