短语词组短语round trifoliated arch 三叶形拱round horseshoe arch 圆马蹄形拱round d arch 半圆拱a round arch 半圆拱half -round arch 半圆拱round arch saggregation 圆头螺丝round arch dam 圆弧拱坝Round arch or Semi -circular arch 半圆拱Arch Round bar 水曲圆棒 返回 round arch