fly shunting

例句：

1. 1. The tunnel is designedto allow vehicles to fly through it withoutstopping.
   这个隧道设计成可以让车辆通过而不停车。
2. 2. The tunnel is a popular spotfor birdwatchers to fly shunting.
   这个隧道是鸟类观察者常去的飞行隧道。
3. 3. The tunnel is alsoused as a transportation hub, allowing peopleto fly shunting between different cities.
   这个隧道还作为交通枢纽，让人们可以在不同的城市之间飞行隧道。