在功能键副键盘的最下方设置有输入法切换键；
The two sub keyboards comprises a digital processing sub keyboard and a function key sub keyboard;
ActiveRecord会为不同的任务变量使用主键和副键，它们都是作为数据库的约束而定义的。
ActiveRecord USES primary and foreign keys for a variety of tasks, and both are defined as constraints on your database.
小心的迷茫的副问题。你的代码将有一个键可以看到所有用户的文件，所以你是负责安全的用户之间。
Be careful of the Confused Deputy problem. Your code will have one key that can see all user's files, so you are responsible for the security between users.
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