Original

The block

The block contains a simple or structured statement that is executed when the program runs. In most programs, the block consists of a compound statement bracketed between the reserved words begin and end whose component statements are simply method calls to the project’s Application object. (Every project has an Application variable that holds an instance of TApplication, TWebApplication, or TServiceApplication.) The block can also contain declarations of constants, types, variables, procedures, and functions; these declarations must precede the statement part of the block.

Topic groups

Programs and units: Overview

Program structure and syntax: Overview

The program heading

The program uses clause

The block

Unit structure and syntax: Overview

The unit heading

The interface section

The implementation section

The initialization section

The finalization section

Unit references and the uses clause

The syntax of a uses clause

Multiple and indirect unit references

Circular unit references

译文

块

块就是程序运行时将被执行的一个简单语句（如赋值、调用对象实例的方法等）或结构化的语句（如循环控制等）。在大部分程序（这里特指program）中，块由一组由保留字begin和end扩起来的混合语句组成，这些混合语句通常只是对工程中Application对象的方法进行简单调用。（每个工程都有一个Application变量，用于保存TApplication、TWebApplication、或TServiceApplication其中之一的实例。）块也可以含有各种声明，如常量、类型、变量、过程以及函数等，但这些声明必需位于块中语句部分之前（就象传统的Pascal编程中主程序的结构）。