PING sfs.scnu.edu.cn (121.8.171.52) 56(84) bytes of data.
64 bytes from 121.8.171.52 (121.8.171.52): icmp_seq=1 ttl=54 time=246 ms
64 bytes from 121.8.171.52 (121.8.171.52): icmp_seq=2 ttl=54 time=244 ms
64 bytes from 121.8.171.52 (121.8.171.52): icmp_seq=3 ttl=54 time=249 ms

--- sfs.scnu.edu.cn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 244.076/246.862/249.988/2.459 ms