In our example, cities are acting like network routers.

在我们的示例中，城市就像网络路由器一样。

Network routers are constantly trying to balance the load across whatever routes they know to ensure speedy and reliable delivery, which is called congestion control.

网络路由器不断尝试在它们知道的任何路由之间平衡负载，以确保快速可靠的传输，这称为拥塞控制。