Original
Blocks and scope
Declarations and statements are
organized into blocks, which define local namespaces (or scopes)
for labels and identifiers. Blocks allow a single identifier, such as a
variable name, to have different meanings in different parts of a program. Each
block is part of the declaration of a program, function, or procedure; each
program, function, or procedure declaration has one block.
译文
块和作用域
块（block）为标号和标识符定义了命名空间（即作用域scope），声明和语句都被组织到块（blocks）中。块允许单独的标识符，例如一个变量名，与程序中其他部分的某个变量同名但具有不同的含义。每个块都是程序、函数、过程等声明的一部分；每个程序、函数、过程等的声明都有一个块。