topology change的用法和樣例：
例句
- Topology changes in one part of a network are not instantly known in other parts of the network due to propagation delay.
由於傳播延遲，某部份的網路拓撲改變時，在網路的另一個部分並不見得能立即知道。 - When the network topology changes, switches and bridges recompute the spanning-tree and cause a disruption in network traffic.
當網路拓撲改變，交換器與橋接器會重新計算擴充樹，此時會導致網路流量的中斷。
