The declaration clause contains declarative statements that declare local and global variables to be used in subsequent clauses.
声明部分包含声明语句，它们声明后续子句中使用的局部和全局变量。
The declaration clause contains declarative statements that declare local and global variables to be used in subsequent clauses.
声明部分包含声明语句，它们声明后续子句中使用的局部和全局变量。
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