PING www.happyedu.org (156.251.39.99) 56(84) bytes of data.
64 bytes from 156.251.39.99 (156.251.39.99): icmp_seq=1 ttl=58 time=258 ms
64 bytes from 156.251.39.99 (156.251.39.99): icmp_seq=2 ttl=58 time=256 ms
64 bytes from 156.251.39.99 (156.251.39.99): icmp_seq=3 ttl=58 time=256 ms

--- www.happyedu.org ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 256.786/257.249/258.128/0.746 ms