We need a fallback position if they won't do the job.

如果他们不干这个工作，我们就需要一个应变的方案。

What's our fallback if they don't come up with the money?

要是他们拿不出钱，我们如何应变？

Yesterday's vote itself was a retreat from an earlier fallback position.

昨天的投票本身就是从早先的预备立场上的退却。

Don't we need a fallback plan?

难道我们不需要一个应急计划吗？

Fallback to humans for manual resolution.

依靠人来进行人工解决。