The main mast gaff 主桅上缘的斜桁
Main Mast Head 主桅顶端显示了放置在中桅上下桅连接处的“死眼”
main-royal mast 主顶桅
main top mast 主一接桅
main royal mast 主顶桅
N the chief mast of a sailing vessel with two or more masts, being the foremast of a yawl, ketch, or dandy and the second mast from the bow of most others 主桅 [nautical]
Main topsail: Shows the topsail added to the Main Mast.
主上桅帆：显示了主桅上的上桅帆。
Main mast top Looking down on the main mast top, you can see through the lubber hole, and the dead-eyes.
主桅杆顶向下看去，在主桅杆桅楼，你可以看到穿过水手孔，和死眼。
Pathological changes for the main mast facet osteoarthritis and spinal canal stenosis, and segmental instability, disc degeneration, spondylolisthesis and spinal ligament calcification, and other.
病理改变主要表现为关节突肥大性骨关节炎及椎管狭窄，以及节段性失稳、椎间盘退变、脊柱滑脱及韧带钙化等。
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