A corner cube consists of three mutually perpendicular reflecting planes . 角棱镜是由3个互相垂直的反射平面组成。
The molecule of the figure has two mutually perpendicular rings with one atom in common . 图中的分子有共用着一个原子的两个互相垂直的环。
In every state of stress there exist at least three principal planes, which are mutually perpendicular . 对每一种应力状态,至少存在三个主平面,它们互相垂直。
Inside the windows three mirrors are placed mutually perpendicular to one another resembling the corner of a cube . side effect 窗内摆放了三面互相垂直的平面镜,形状就如正方体的一角。
Two mirrors are placed inside the windows . they are mutually perpendicular and at the same time inclined at 45xwith the ground 窗内摆放了两面与地面成45度倾斜的平面镜,两者的夹角成90度。