PING bme.med.tsinghua.edu.cn (101.6.15.66) 56(84) bytes of data.
64 bytes from 101.6.15.66 (101.6.15.66): icmp_seq=1 ttl=48 time=250 ms
64 bytes from 101.6.15.66 (101.6.15.66): icmp_seq=2 ttl=48 time=251 ms
64 bytes from 101.6.15.66 (101.6.15.66): icmp_seq=3 ttl=48 time=248 ms

--- bme.med.tsinghua.edu.cn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2001ms
rtt min/avg/max/mdev = 248.051/249.853/251.010/1.414 ms