在宏内开头定义DATABASE变量告诉它要连接到哪一个数据库。
Define a database variable initially within the macro to tell it which database to connect to.
它还支持在宏间复制流程，并为添加新界面提供了拖拉操作的支持功能。
It also allows flows to be copied between macros and provides drag-and-drop support for adding new screens.
健康的宏在宏中安全地引入变量名，但是有时候也想让宏成为非健康的。
While hygienic macros make introducing variable names within macros safe, there are cases in which you will want your macros to be non-hygienic.
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