相關(guān)單詞同義詞back, fall, 近義詞 replacement 更換, contingency 偶發(fā)事件, alternative 兩者擇一的, stand-in 替身, substitute 代用品, reserve 保畱, backup 後備, pullout 撤離, disengagement 解脫臨近詞Fallou, fall, fall all over themselves, falling-off phenomenon, Fall under this category, fallen-building clause, falling ball impact test, fall all over yourselves, fall in with sb's desire, Fall behind sb in sth., falling-sand apparatus, fall-back high jumping相似詞fall to sb, fall/slip through the cracks idiom, fallacious, fallacy, fallen, fallen idol, fallen woman, faller, 返回 fallback