During the foreign key enforcement, the server USES the sequential scan, instead of foreign key index.
在外键加强过程中，服务器使用顺序扫描，而不是外键索引。
An arbitrary key is usually just a sequential number, where the next available number is assigned when a new key is required.
任意键通常只是一个序列号，当需要一个新键时，就分配下一个可用的号码。
The gray scale projection algorithm is a key technique for detecting motion vector of image sequential frames and realize electronic image stabilization.
灰度投影算法是检测图像序列帧间运动矢量，实现电子稳像的关键技术之一。
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