... double-acting steam cylinder 双向作用的蒸汽气缸 down halyard 降帆索 design spiral 设计螺旋循环方式 ...
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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。
At almost the same time our Genoa halyard jammed and we couldn't get the sail down.
同时，三角帆的升降索卡住了，我们无法及时降下三角帆。
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