... 回转频率gyrofrequency 中桅帆gaff-top-sail 高架起重机gantryorgauntry,organtrycrane ...
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At the top of the sail is a short SPAR called the gaff, which allows the sail to extend back along a fourth side, gaining size over a triangular sail of the same height.
在帆面的上方是一根短的圆杆,称为斜桁(gaff),使得帆面可以在第四条边上延长,因而比同等高度的三角帆面积更大。
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