valid combination的意思|示意

All of the bits in the host address portion of the IP address are set to 0. Please enter a valid combination of IP address and subnet mask.

IP地址的主机地址部分里的所有字节都被设置为0。请输入一个有效的IP地址和子网掩码组合。

Okay so the only thing that's ruled out in arguments being valid is the possibility, not the actuality, of the combination of the premises being true and the conclusion false.

好，唯一能排除论点有效性的是，是可能性，不是实际性，而是真前提，和假结论的结合。

All of the bits in the network address portion of the IP address are set to 0. Please enter a valid combination of IP address and subnet mask.

IP地址的网络地址部分里的所有字节都被设置为0。请输入一个有效的IP地址和子网掩码组合。