block mast 矩方头桅; 三角短桅..
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mast head span block 上千斤滑车
mast power block 吊挂式动力滑车
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The halyard typically rises from the head of the sail to a block at the head of the mast and back down to deck level, from where it is pulled up to raise the sail.
升降索通常从帆的前侧延伸到桅杆顶端，然后下降到甲板平面，在甲板上拉起升降索就能升起船帆。
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