PING www.modernlab.cn (104.21.19.20) 56(84) bytes of data.
64 bytes from 104.21.19.20 (104.21.19.20): icmp_seq=1 ttl=60 time=4.96 ms
64 bytes from 104.21.19.20 (104.21.19.20): icmp_seq=2 ttl=60 time=4.72 ms
64 bytes from 104.21.19.20 (104.21.19.20): icmp_seq=3 ttl=60 time=4.69 ms

--- www.modernlab.cn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 4.690/4.791/4.963/0.145 ms