... primary winding voltage 一次绕组电压，原绕组电压，初级绕组电压 primary X-ray beam原X射线束 prime 主要的，原始的，质数，第一阶 ...
双语例句
1
The intensity of the secondary radiations is weak compared with the intensity of the primaryX-raybeam, and some of it, too, may not escape from the material.