2007年前这种方式是不成功的，很可能是因为执行计划的人低估了需要花费的时间并且去了解的很少。

Before 2007, it was unsuccessful, likely because the forces administering it tended to spend less time in their communities and so knew less about them.

youdao

那是一个假设南部部署军成功的计划，而实际有可能不成功。

That is the plan, assuming the southern deployment succeeds. It may not.

youdao

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.

youdao