physical connection的用法和樣例：
例句
- Network Topology is basically a description of how the physical connections of a network are set up.
對於一個網路，通常需要用網路拓撲來描述它的物理連接以及設置情況。 - While it is not essential for an Intranet to have a physical connection into the Internet, the benefits can often outweigh the risks.
然而，內部網不必一定與互聯網有物理連接，這樣做常常是好處大於風險。
