a buttress that stands apart from the main structure and connected to it by an arch 同义词：arc-boutant,
例句与用法
1.
The introduction of a system of flying buttresses made possible the reduction of wall surfaces by relieving them of part of their structural function 飞拱建筑体系的引入，减轻了墙体的支撑功能，从而减小了墙面。
2.
Here , hundreds of feet up , the redwood ' s massive limbs are fused into flying buttresses and carved by forest fires into blackened chambers called “ fire caves ” 在这里，几百英尺高的地方，红木粗大的树枝熔铸成飞拱，在森林大火中被塑造成幽黑密室“出火坑” 。
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