portal of exit

例句：

1. 1. The portal to the library is through this door.
   通往图书馆的门通过这扇门。
2. 2.The portal to the new world was a bridge over the river.
   通往新世界的大门是一座横跨河流的桥。
3. 3.The portal to the future is always open for those who dare to dream.
   通往未来的大门总是敞开的，对于那些敢于梦想的人来说。