源表受保护，目标表不受保护。
The source table is protected, and the target table is unprotected.
目标表受保护，源表不受保护。
The target table is protected, and the source table is unprotected.
进入目标的行失去了保护，因为目标表不受保护。
Rows that go into the target lose their protection, because the target table is unprotected.
进入目标的行失去了保护，因为目标表不受保护。
Rows that go into the target lose their protection, because the target table is unprotected.
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