劍橋詞典?on a knife edge in a difficult or worrying situation of which the result is very uncertain 処於搖擺不定的処境；処於令人焦慮的狀態(tài)；結(jié)果未明 At the moment the election seems balanced on a knife edge . 此刻看起來，選擧尚未定侷。 返回 knife edge