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有一年夏天，曹操率领部队去讨伐张绣，天气热得出奇，骄阳似火，天上一丝云彩也没有，部队在弯弯曲曲的山道上行走，两边密密的树木和被阳光晒得滚烫的山石，让人透不过气来。到了中午时分，士兵的衣服都湿透了，行军的速度也慢下来，有几个体弱的士兵竟晕倒在路边。
曹操看行军的速度越来越慢，担心贻误战机，心里很是着急。可是，眼下几万人马连水都喝不上，又怎么能加快速度呢？他立刻叫来向导，悄悄问他：“这附近可有水源？”向导摇摇头说：“泉水在山谷的那一边，要绕道过去还有很远的路程。”曹操想了一下说，“不行，时间来不及。”他看了看前边的树林，沉思了一会儿，对向导说：“你什么也别说，我来想办法。”他知道此刻即使下命令要求部队加快速度也无济于事。脑筋一转，办法来了，他一夹马肚子，快速赶到队伍前面，用马鞭指着前方说：“士兵们，我知道前面有一大片梅林，那里的梅子又大又好吃，我们快点赶路，绕过这个山丘就到梅林了！”士兵们一听，仿佛已经吃到嘴里，精神大振，步伐不由得加快了许多。
故事出自《世说新语·假谲》。成语“望梅止渴”，比喻用空想安慰自己或他人。
Quenching Thirst by Watching plums
Cao Cao of the Three Kingdoms period (220-265) was not only a capable politician in managing state affairs, but also a strategist good at leading troops in going to war.
One summer, Cao Cao was leading his troops in a punitive expedition against Zhang Xiu. It was extraordinarily hot. The burning sun was like a fire, and the sky was cloudless. The soldiers were walking on the winding mountain paths. The dense forest and the hot rocks exposed to the sun on both sides of the paths made the soldiers feel suffocated. By noontime the soldiers' clothes were wet through with sweat, and the marching speed slowed down. Some solders of weak physique even fainted on the roadside.
Seeing that the marching speed was slower and slower, Cao Cao was very worried because he feared that he might bungle the chance of winning the battle. But how could they quicken their speed? Cao Cao at once callde the guide and asked him on the quiet whether there was a source of water nearby. The guide shook his head, saying that the spring water was on the other side of the mountain, which was very far to have to make a detour to reach. Cao Cao realized that time didn't permit them to make such a detour. After thinking for a moment, he said to the guide, "Keep quiet. I'll find a way out." He
当务之急
【注音】dāng wù zhī jí
【成语故事】战国时期，孟子的弟子问他现在要办的事情很多该如何处理，孟子说应该知道要做的事情中哪些是最急需办的就先办，不能面面俱到。如果父母死子女在服丧期间吃饭狼吞虎咽，喝汤时响声很大，这就是舍本逐末，不知自己当前该干什么。
【出处】知者无不知也，当务之为急；仁者无不爱也，急亲贤之为务。 《孟子·尽心上》
【解释】当务：指应当办理的事。当前任务中最急切要办的事。
【用法】作主语、宾语；用于判断语句中
【相近词】燃眉之急、迫在眉睫、事不宜迟
【相反词】一拖再拖、遥遥无期
【成语例句】
◎ 当务之急，是把火头就地消灭，否则风向一变，难保它不会夺路而走，继续毁坏森林。
◎ 针对眼前发生的灾情，田纪云指出，当务之急是要抓住时机抢收抢种、补栽补种。
◎ 怀疑归怀疑，当务之急是要把发票的真假搞清楚。
◎ 许多院校提出，军事教育所面临的当务之急既不是技术问题，也不是经费问题，而是观念问题。