sea gate

例句：

1. 1. The seagate is the main entrance to the city.
   海港门是城市的主要入口。
2. 2. Thesea gate was closed due to a storm.
   由于暴风雨，海港门关闭了。
3. 3.The sea gate is a popular tourist destination.
   海港门是一个受欢迎的旅游景点。