a network of roads的用法和样例：
- A network of roads, railways, canals, etc.
- There is a complex network of roads round the city.
- Under the mountain there is a network of caves.
- So they set about building a network of roads and encouraging loggers and cattle companies to move in.
- The company has a network of shops all over the country.
- The fabrics are merchandised through a network of dealers.