PING acm.sjtu.edu.cn (202.120.61.16) 56(84) bytes of data.
64 bytes from 202.120.61.16 (202.120.61.16): icmp_seq=1 ttl=48 time=243 ms
64 bytes from 202.120.61.16 (202.120.61.16): icmp_seq=2 ttl=48 time=241 ms
64 bytes from 202.120.61.16 (202.120.61.16): icmp_seq=3 ttl=48 time=242 ms

--- acm.sjtu.edu.cn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2226ms
rtt min/avg/max/mdev = 241.952/242.598/243.796/0.847 ms