主机不可到达 meaning in Chinese

host unreachable

As described above , the icmp destination unreachable message gives a gateway trying to forward a message a tool to inform the sender that the message could not be delivered because the host specified in the datagram s destination address could not be reached
如上所述， icmp目的地不可到达消息向尝试转发消息的网关提供了一种工具，用来通知发送方：因为在数据报目的地地址中指定的主机不可到达，所以无法传递该消息。