确保有一个可行的备份策略随时可用，这样升级或其他维护活动都可以顺利完成。
Upgrades and other maintenance activities can also be conducted with assurance that a viable back out strategy is available.
由于有巨大的地址空间可用因此这种方案是可行的而且一般不会有地址冲突问题。
This has been found to be successful due to the enormous range of addresses available, and contention for the address space being without problems typically.
在文档交付开发人员之前，我们要反复检验产品的可用性、合意性和可行性。
We need to test (validate) usability, desirability and feasibility -before proceeding to engineering.
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