后桅纵帆

例句：

1. 1. The sailors were busy adjusting the sails on the ship's aftermast.
   水手们在调整船上后桅的主帆。
2. 2. After a long day at sea, the captain decided to set up his aftermast for the night.
   在海上度过了漫长的一天后，船长决定晚上设置他的后桅主帆。
3. 3. The wind was blowing strongly from the west, making it difficult to set up the aftermast.
   风从西面吹来，使得很难升起后桅主帆。