将api层方法修改为REQUIRED并添加回滚逻辑，这样会带来“api层策略”中的“局限和限制”一节中概述的相同问题。

Changing the API-layer methods to REQUIRED and adding rollback logic introduces the same problems outlined in the Limitations and Restrictions section in "the API layer strategy."

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如第1部分所述，任何超级集群拓扑结构都存在限制和局限性。

As mentioned in Part 1, there are restrictions and limitations with any super cluster topology.

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然而，该战略也有一定的局限性，包括限制消费者每年只能购买一张这样的卡片。

There are some limitations, however, including limiting consumers to just one such card purchase per year.

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