短語(yǔ)詞組短語(yǔ)backfall detail 滑落backfall crest 山頂;詳細(xì)繙譯backfall crown 山頂backfall pocket 山形部前坡backfall slope 山形部後坡backfall l 山坡backfall acme 山頂recoildraw backfall backretreat 後退 返回 backfall