$ ping mirrors.tuna.tsinghua.edu.cn PING mirrors.tuna.tsinghua.edu.cn (101.6.31.4) 56(84) bytes of data. 64 bytes from 101.6.31.4: icmp_req=1 ttl=40 time=5243 ms 64 bytes from 101.6.31.4: icmp_req=2 ttl=40 time=5404 ms 64 bytes from 101.6.31.4: icmp_req=3 ttl=40 time=5194 ms 64 bytes from 101.6.31.4: icmp_req=4 ttl=40 time=5177 ms
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