fallback
/'fɔːlbæk/ /'fɔːlbæk/
n. 可依靠的东西；撤退，退却
词
n. 
想词
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fivesome, five-spot, five-star, fivestones, fivette, fix, fix in with, fix on, fix up, fixable,
相似单词
fallal, fal-lal, fallalery, fallaway, fall-away, fallback, fallboard, fallen, fallen arch, faller,