No flat surface perpendicular to the pseudo-twofold axis could be formed. 不能自然形成垂直于偽二次軸方向的平坦的表面小平面。
The long axes of the ellipsoidal shaped calcareous concretion reflected the direction of movement of mineralizing groundwaters. 橢圓形的鈣質結核的長軸方向反映了地下礦化水的流動方向。