信息输入是数控车床自动编程系统的第一个环节，提出信息输入建模方法的研究，旨在解决NC本削自动加工所需数据的输入，存储和快建传递的问题。
This paper aims at discussing the research of information input process and storage method which are used in NC programming system.
节点布置是无线传感器网络（Wireless Sensor Network，WSN）的一个基本问题，是对监测区域的有效覆盖，也是网络初始化的第一个环节。
Sensor deployment is the basic problem in Wireless Sensor Network ( WSN), which is also made to cover the monitored area efficiently and the first step for sensor network initialization.
由于流程建模是进行BPR的第一个环节，所以选择合适的工具尤为重要。
Because process modeling is the first tache to carry through BPR, it is very important to choose appropriate tools.
Boot loader也是嵌入式系统软件开发的第一个环节，它将软硬件紧密地衔接在一起，这对于一个嵌入式设备后续的软件开发至关重要。
Boot Loader is the first link in embedded system software development, and intimately connected hardware with software. It is important for a follow-up of embedded system software development.