port mouth

例句：

1. 1.The ship entered the port mouth and docked at the pier.
   船只进入港口入口并停靠在码头。
2. 2. The cargo was loaded onto the ship at the port mouth.
   货物被装载到船上，在港口入口。
3. 3.The port mouth is a critical point for the ship's navigation.
   港口入口是船只导航的关键地点。