如果需要撤销安全更改，这是一个非常灵巧的撤销计划。
That's a pretty clever back-out plan, if you need to reverse your security changes.
如果不成功，迁移看起来完全就像故障转移测试，因为退回技术取代了旧式的撤销计划。
If not, migration looks exactly like a failover test because the failback technique replaces the old style backout plan.
他们已被迫撤销了建筑新校舍的计划。
They had been forced to scrap plans for a new school building.
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