unit construction principle

• 组合结构原理

unit construction principle的用法和样例：

例句

1. In this paper, the structural principle of ENI is briefly dealt with.
   本文简要地介绍了工频指零器的结构原理。
2. A locking device and a reverse counterboring tool bar are designed, their structure and working principle are introduced.
   设计了一种锁紧装置和一反锪孔刀杆，介绍了其结构原理。