基本解释[數學]三重對稱三次對稱英汉例句雙語例句And fivefold, threefold and twofold axes of rotational symmetry.五重，三重和兩重螺鏇對稱軸。threefold symmetry更多例句词组短语短語threefold axis of symmetry 三重對稱軸threefold symmetry更多词组专业释义數學三重對稱三次對稱