PING www.huaxueshiji.com.cn (47.109.141.21) 56(84) bytes of data.
64 bytes from 47.109.141.21 (47.109.141.21): icmp_seq=1 ttl=45 time=283 ms
64 bytes from 47.109.141.21 (47.109.141.21): icmp_seq=2 ttl=45 time=282 ms
64 bytes from 47.109.141.21 (47.109.141.21): icmp_seq=3 ttl=45 time=282 ms

--- www.huaxueshiji.com.cn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2001ms
rtt min/avg/max/mdev = 282.899/283.043/283.267/0.160 ms