Use the REVERT statement to return to the previous context.
使用REVERT语句返回到以前的上下文。
The REVERT statement is then used to reset the execution context to the previous caller.
然后使用REVERT语句将执行上下文重置为上一个调用方。
The REVERT statement is executed multiple times moving up the stack until the execution context is set to the original caller.
将多次执行REVERT语句以向上移动堆栈，直到将执行上下文设置为原始调用方为止。
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