fallback

n.

可依靠的东西，退却；回降物；

1. 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。

PSTN fallback using dial on demand routing scheme
The fallback procedure for evaluating a single family of hypotheses
Evolutionary Consequences of Fallback Foods
Emission Spectra of Fallback Disks Around Young Neutron Stars
Personal knowledge questions for fallback authentication:security questions in the era of Facebook
Shuttling Between Depictive Models and Abstract Rules: Induction and Fallback
The rise of the hominids as an adaptive shift in fallback foods: plant underground storage organs (USOs) and australopith origins.
The rise of hominids as an adaptive shift in fallback foods: Plant underground storage organs (USOs) and australopith origins. Journ...
Hardness of cercopithecine foods: implications for the critical function of enamel thickness in exploiting fallback foods.
Laden, G. and R. Wrangham. The rise of the hominids as an adaptive shift in fallback foods: plant underground storage organs (USOs) ...