They do not allow two-layer routing and have no channels, so you cannot use a channel-based router.

他们不允许两层布线并且没有通道，因此你不能用一个基于通道的布线器。

youdao

Thus, in multi-layer routing, to reduce the number of vias is an important and urgent problem to be addressed.

因此，在多层布线时，减少通孔数是一个十分重要和迫切需要解决的问题。

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Current Internet adopts IP-based network-layer routing and name resolution-based Domain name System (DNS) application-layer routing.

现有互联网采用了基于IP地址的网络层路由技术和基于域名解析的域名服务器(DNS)应用层路由技术。

youdao

The tool attacks the routing layer, affecting protocols like Mint Route and MultiHopLQI to collect, redirect or delete data.

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Switches with built-in routing, also known as Layer 3 switches, are expected to catch on as router replacements once the boxes are equipped with WAN interfaces and support for multiple protocols -- two features backbone routers have long had.

CNN: Networking trends emerge for '99