使用此语句无法还原当前安全上下文。'Revert' 语句可能需要，也可能不需要 cookie，具体取决于该上下文是如何使用 'Execute As' 语句设置的。

The current security context cannot be reverted using this statement. A cookie may or may not be needed with 'Revert' statement depending on how the context was set with 'Execute As' statement.