three fold axis的用法和樣例：
例句
- No flat surface perpendicular to the pseudo-twofold axis could be formed.
不能自然形成垂直於偽二次軸方向的平坦的表面小平面。
three fold axis的相關資料：
臨近單詞
three tank
three
three phase synchronous generator
three-stage constructed wetland
three dimensional self-aligning
three factor design of experiment
three-share mounted paring plow
three-dimensional ring molecule
three- dimension reconstruction
three-phase asynchronous motors
three-point position regulation
three-phase three-wire system
