可撤销次数依赖于存储需求。
The number of operations depends on their memory requirements.
Undo 操作是多级的并且增加了可以执行撤销操作的次数。
Undo operations are multi-level and expand the number of operations that can be undone.
注：优惠券折扣无撤销选项，但是您可以通过修改使用次数和有效期限来提前结束折扣。
Note: Coupon offers do not have the disable option but you can edit the quantity of USES or the expiration date to end the offer early.
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