perpendicular plane

基本解释

With the aid of a plane and a center for the datum plane. (3) to two mutually perpendicular plane as a benchmark.
② 以一个平面与一个中心平面为基准。 ③ 以两个互相垂直的中心平面为基准。
When bouncing your flash, at certain angles close to that perpendicular plane, direct light will hit your subject.
当使用跳灯时，即使闪光灯以接近垂直的角度向上方打光，但仍有扩散的光线直接照射到被摄体上。
The first step of the migration is performed within the perpendicular plane, and the second step of migration is the spatial migration of the side waves.
第一步偏移的实质是在铅垂平面内完成偏移归位，第二步偏移是在空间内完成侧面波的空间归位。

The theoretical part of the seminar on the measurement technology including the principle of a measurement survey, a plane-table method, a perpendicular survey, a traverse survey, a GPS survey, and using a total station will be conducted at the premises of the Institute of Fine Arts.
UNESCO: 7-8 November 2012, Tashkent, Uzbekistan