PING www.zhengniu.cn (140.249.18.155) 56(84) bytes of data.
64 bytes from 140.249.18.155 (140.249.18.155): icmp_seq=1 ttl=46 time=288 ms
64 bytes from 140.249.18.155 (140.249.18.155): icmp_seq=2 ttl=46 time=287 ms
64 bytes from 140.249.18.155 (140.249.18.155): icmp_seq=3 ttl=46 time=287 ms

--- www.zhengniu.cn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 287.545/287.870/288.248/0.525 ms