adj. irrevocable ; ineffaceable
婚姻是什么呢？是不能取消的誓言。
您承认，在一般情况下，任何或所有证券买卖交易指示一经发出是不能取消的。
You acknowledge that it is not usually possible to cancel an instruction for any or all transactions in securities after it has been given.
这意味着，故障转移发生时，不能取消未完成的回调。
This means that when a failover occurs, it's not possible to cancel outstanding callbacks.
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