1. A sequential control system performs a set of operations in a prescribed manner. 一个时序控制系统进行一套操作以被规定的方式。
2. The second is where you have to integrate the loop closely with the sequential logic. 第二点是，人们必须将一些控制环与顺序逻辑控制更紧密地集成。
3. At one extreme, you can construct a system as a long string of sequential operations, such as we do in a meandering factory assembly line. 一个极端是，你可以把系统构建成一连串的顺序操作系统，就像我们使用的曲折的工厂装配流水线一样。
