Shows the trestletrees, crosstrees, and the eye bolts for the futtock shrouds.
树状支架，树状十字及为连接上下桅得铁索得眼螺栓。
a bracket on the mast of a ship to support the trestletrees
船桅杆上用来支撑桅顶纵桁的托座
A bracket on the mast of a ship to support the trestletrees.
桅肩加强板, 夹板船桅杆上用来支撑桅顶纵桁的托座
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