sail arm

例句：

1. 1. The sail arm is the part of a sail that extends outward from the mast.
   桅杆是帆从桅杆向外延伸的部分。
2. 2. The sailors were busy adjusting the sail arm to catch the wind.
   水手们忙着调整桅杆以捕捉风力。
3. 3.The sail arm was damaged during the storm, which made sailing difficult.
   风暴损坏了桅杆，使航行变得困难。