如果它的希望落空，就会再次检索值，并重做递增计算。

If it is wrong, it has to fetch the value again and redo the increment computation.

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由于这些指标永远都是递增的，所以必须事先确定一个基准，再根据它计算出之后的差量。

Because these metrics perpetually increment, you must take a baseline before and calculate the difference afterward.

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在计数器的示例中，冒险的步骤是递增——它检索旧值并在旧值上加一，希望在计算更新期间值不会变化。

In the case of the counter, the speculative step is the increment — it fetches and adds one to the old value in the hopes that the value will not change while the update is being computed.

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