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=45 time=308 ms
64 bytes from 140.249.18.155 (140.249.18.155): icmp_seq=2 ttl=45 time=305 ms
64 bytes from 140.249.18.155 (140.249.18.155): icmp_seq=3 ttl=45 time=306 ms

--- www.zhengniu.cn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 305.124/306.783/308.527/1.462 ms