curved jib

例句：

1. 1.The ship's mainmast was curved and made of wood.
   这艘船的主桅是弯曲的，由木头制成。
2. 2.The curved boom extended from the stern to the bow, supporting the sails.
   弯曲的帆桁从船尾延伸到船头，支撑着帆。
3. 3. The curved boom arm allowed the sailors to adjust the sails easily.
   弯曲的帆桁臂使水手们能够轻松地调整帆。