complete, 补全, line of symmetry, 轴对称, symmetry, 对称, symmetrical shape, 对称图形, fold, 对折, match, 重合, equal on both sides, 两边一样, rotation, 旋转, center of rotation, 旋转中心, clockwise, 顺时针, counterclockwise, 逆时针, angle, 角度

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