因为类型化表包含其他对象引用的对象，所以每个类型化表都必须像它的第一列那样拥有一个对象标识符。
Because typed tables contain objects that can be referenced by other objects, every typed table must have an object identifier column as its first column.
所有回调方法共有第一个参数作为一个特定业务组件的标识符。
All callback methods have in common the first parameter as the identifier of a particular business component instance.
这个宏的第一个参数是指代正在处理的特定按钮的标识符。
The first parameter to the macro is an identifier referring to the specific button being handled.
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