作为一种全波方法，对于多个源或端口问题的分析有很高的效率。

As a full wave technique method, the FDTD method is very efficient at modeling problems involving multiple sources or ports.

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如果无法到达这个网关，那么从您主机上的网络适配器到网关的物理连接可能有问题（例如交换机端口、线路和网卡有故障）。

If it isn't, there may be a problem with the physical connection from the network adapter on your host to the gateway (for example, a faulty switch port, cable, network card).

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结果表示 DNS 出现问题，特别是当端口 139 和 445 在 192.168.1.138 上做出反应时。

This result points to a problem with DNS, especially if ports 139 and 445 are responsive on 192.168.1.138.

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