劍橋詞典?on a knife edge in a difficult or worrying situation of which the result is very uncertain 處于搖擺不定的處境；處于令人焦慮的狀態(tài)；結(jié)果未明 At the moment the election seems balanced on a knife edge . 此刻看起來(lái)，選舉尚未定局。 返回 knife edge