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fallback/
'fɔl.bæk
'fɔːlbæk
/
1.noun
可依靠的东西
2.noun
(紧急时)可依靠的东西,可指望之物,备用品[金]
3.noun
撤退，退却
4.noun
(发生故障时的)备用系统;退却,后退
5.noun
后退