贯穿全国的公路网络非常庞大。

The ___network of highways across the country is extensive.

我们公司正在投资以使其计算机网络现代化。

Our company is investing to modernize its computer ___network.

高效的运输依赖于维护良好的铁路网络。

Efficient transportation relies on a well-maintained rail ___network.