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depressed arch
bridg.constr. 坦圆拱
construct. 低圆拱
hydroel.st. 低拱; 平拱
met. 平坦拱
tech. 小矢高拱; 四心拱; 低圆拱; 垂拱; 扁平拱; 拱心在起拱线下的平坦拱

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