短语词组短語arch abdomen dam 腹拱垻Arch -dam 弓形門arch gravity dam 重力拱垻;拱形重力垻arch buttress dam 拱式支墩垻rcc -arch-dam 碾壓混凝土拱垻high -arch-dam 高拱垻multi -arch concrete dam 混凝土連拱垻double -curvature arch rcc dam 碾壓混凝土雙曲拱垻thick arch dam 重力拱垻 返回 arch dam