另一方面，如果没有一个当前应用已通过的验收测试，要确定是否没有百分百成功完成迁移比较困难。
On the other hand, without an acceptance test that the current application passes it will be difficult if not impossible to determine if the migration is complete much less a success.
另一方面，如果没有一个当前应用已通过的验收测试，要确定是否没有百分百成功完成迁移比较困难。
On the other hand, without an acceptance test that the current application passes it will be difficult if not impossible to determine if the migration is complete much less a success.
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