短语词组短語depressed semicircle 扁半圓Halbkreis semicircle 半圓semicircle key 半圓鍵navigable semicircle [氣象]可航半圓open semicircle 開半圓SEMICIRCLE PATRN 半圓圖案;珠網葉子貼圖材料left semicircle 左半圓 返回 semicircle