PING www.ustc.org (185.53.178.99) 56(84) bytes of data.
64 bytes from 185.53.178.99 (185.53.178.99): icmp_seq=1 ttl=55 time=18.4 ms
64 bytes from 185.53.178.99 (185.53.178.99): icmp_seq=2 ttl=55 time=17.8 ms
64 bytes from 185.53.178.99 (185.53.178.99): icmp_seq=3 ttl=55 time=17.8 ms

--- www.ustc.org ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms
rtt min/avg/max/mdev = 17.835/18.049/18.438/0.296 ms