嵌套语句 meaning in English

nested statement

There are usually no nested statements, blocks, and so forth in assembler statements .
在这些汇编语句中通常不包含嵌套语句，分程序等等。
A local variable , already declared in an enclosing block and therefore visible in a nested block , cannot be redeclared in the nested block
一个语句块里的变量，可以被其他语句块再次声明，但是不可以在嵌套语句块声明，但是在嵌套块里他是可视的。