Scientific classification should satisfy three requ ir ements: no omission, no intersections and being flexible to be operated.
科学分类应当满足无漏、无交叉、易操作三个条件。
Defining all of our SQL statements at the top of the file makes it easier to read the code and modify the ements to tweak our application.
在文件的顶部定义我们所有的sql语句可以使阅读代码，以及修改元素以调整应用程序变得更容易。
An Area Control Computer Interlocking System (AC-CIS) im pl ements integrated control over station interlocking, section block, and dispatching and command.
区域计算机联锁系统实现车站联锁、区间闭塞和调度指挥一体化控制。
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