执行PLSQL时报错

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执行PLSQL时报错：
ORA-06550: 第 12 行, 第 1 列:
PLS-00103: Encountered the symbol “DBMS_OUTPUT” when expecting one of the
following:
:= . ( @ % ;
The symbol “:=” was substituted for “DBMS_OUTPUT” to continue.

最后找到原因，是因为少个；。