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燃:烧。火烧眉毛那样紧急。形容事情非常急迫。
[as pressing as a fire singeing one's eyebrows——a matter of extreme urgency;be urgently critical;immediate danger;pressing need] 十分紧急,如同火烧眉毛 我如今不知便罢,既是天教我知了,正是度日如年,燃眉之急!——《水浒传》