一…不…yī…bù…
1.分别用在两个动作前面,表示动作或情况一经发生就不改变{[used before two verbs to indicate the inalterability of a situation]}:～定～易{unalterable}|～去～返{gone never to return}|～蹶～振。{never recover from a setback}
2.分别用在一个名词和一个动词前面,表示强调或夸张{[used before a noun and a verb to indicate emphasis or exaggeration] not a single; not the slightest}:～言～发{not utter a word}|～字～漏{without missing a single word}|～钱～值{not worth a penny; utterly worthless; mere trash}|～毛～拔。{unwilling to give up even a hair; very stingy}€