fallback
/'fɔːlbæk/ /'fɔːlbæk/
n. 可依靠的东西；撤退，退却
词
n. 
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maple syrup, maple-leaf, maples, mapless, mapmaker, mapmaking, MAPOS, mappable, mapped, mapper,
相似单词
fallal, fal-lal, fallalery, fallaway, fall-away, fallback, fallboard, fallen, fallen arch, faller,