PING www.ustc.org (185.53.178.52) 56(84) bytes of data.
64 bytes from 185.53.178.52 (185.53.178.52): icmp_seq=1 ttl=55 time=17.7 ms
64 bytes from 185.53.178.52 (185.53.178.52): icmp_seq=2 ttl=55 time=17.2 ms
64 bytes from 185.53.178.52 (185.53.178.52): icmp_seq=3 ttl=55 time=17.3 ms

--- www.ustc.org ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 17.239/17.427/17.730/0.264 ms