(帆船)船桅定位技术
The second mast aft of a sailing ship with three or more masts. 主桅有三根桅或更多桅帆船的第二根船尾桅
A platform enclosing the head of each mast of a sailing ship, to which the topmast rigging is attached. 桅楼，桅盘帆船上包围着所有帆头的平台，顶桅索具就加结于其上
A sailing ship with from three to five masts of which only the foremast is square-rigged, the others being fore-and-aft rigged. 三桅船有三至五个桅杆且只有前部桅杆有横帆装置其余均有纵帆装置的帆船
