section, principal meaning in English

主截面

During the design of the microprocessor section , principal line is microprocessor interface . and some important problems of the system design was researched mainly
单片机系统设计这一部分以单片机接口设计为主线，并对系统软件设计过程中一些重要问题进行了重点研究。
The following paper is about a type of instrument for the signal collection that can be used to monitor big - size bearing . the key technology about it is also introduced . during the analogue section , principal line is analogue signal pspice simulation
在故障检测仪前向模拟信号处理部分，以模拟信号的pspice分析与仿真为主线，分析与设计了传感器、低通有源滤波器等部分的内容。