I also assume that you know the basics of working with classes and objects in PHP, as the PHP components used in this article are written in compliance with OOP principles.
还假定读者了解在php中的类与对象的相关知识，因为文中所采用的PHP组件是遵照OOP原则来编写的。
The paper features in detail its constitution and functions, working principles of its main components and change-over relation between radio signal and mechanical action, etc.
本文对其组成与功能、主要部分的工作原理、无线电信号与机械动作的转换关系等作了较详细的阐述。
An in-situ optical monitoring system for thin film deposition is introduced. The components of the system, functions and working principles of each module are analyzed.
介绍了一种薄膜制造实时光学监控系统，对监控系统的组成及各个模块的功能和工作原理进行分析。
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