flying buttress
noun [ C ] architecture specialized uk/ˌflaɪ.ɪŋ ˈbʌt.rəs/ us/ˌflaɪ.ɪŋ ˈbʌt.rəs/
（尤指教堂的）拱扶垛
an arch built against a wall, especially of a church, to support its weight
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