fall back

后退，退却

fairyland, fait accompli, faith, faith-cure, faith-healer, faithful, faithfully, faithfulness, faithless, faithlessly, faithlessness, fake, faker, fakir, falcon, falconer, falconry, fall, fall apart, fall away, fall back on, fall behind, fall behind (sb/sth), fall by the wayside, fall down, fall for, fall for sb, fall guy, fall in, fall in love, fall in love (with), fall in love with, fall in love with sb., fall in with, fall into, fall into step, fall into sth, fall off, fall on one's knees, fall on/upon sb/sth,