如临大敌 like facing a great enemy
Explanation
形容面对重大挑战或危机时，高度戒备，紧张情绪如同面对强大的敌人一样。多用于比喻义，表示对局势的严重性估计过高。
It describes a state of high alert and tension when facing major challenges or crises, as if facing a powerful enemy. Mostly used in a figurative sense, indicating an overestimation of the severity of the situation.
Origin Story
唐末，黄巢起义，攻破长安。唐僖宗逃往蜀地，命郑畋为凤翔节度使，坚守凤翔。郑畋到任后，立即修筑城防，操练军队，加固城墙，将家产分给士兵，激励士气，整军备战。全城军民严阵以待，人人如临大敌，时刻准备着与黄巢的军队决战。最终，依靠着严密的防卫和士兵们的英勇作战，凤翔城成功抵御住了黄巢军队的进攻，保全了唐朝的最后一道防线。
In the late Tang Dynasty, Huang Chao rebelled and captured Chang'an. Emperor Xizong fled to Shu and appointed Zheng Tian as the military governor of Fengxiang to defend the city. Upon taking office, Zheng Tian immediately started building city defenses, drilling troops, strengthening the city walls, and distributing his personal wealth to boost morale and prepare for war. The entire city was on high alert, everyone was prepared as if facing a great enemy, ready to fight Huang Chao's army at any moment. Eventually, due to their strong defense and the soldiers' courageous fight, Fengxiang successfully defended against Huang Chao's army, preserving the last line of defense of the Tang Dynasty.
Usage
常用来形容对某种情况或事件的重视程度，如同面对强大的敌人一样，形容非常紧张和戒备。
It is often used to describe the level of importance attached to a situation or event, as if facing a powerful enemy. It describes great tension and preparedness.
Examples
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面对突如其来的困难，我们不能如临大敌，而应沉着冷静地应对。
miàn duì tū rú qí lái de kùnnán,wǒmen bù néng rú lín dà dí, ér yīng chénzhuó língjìng de yìngduì. kǎoshì lái lín,tā rú lín dà dí,rènzhēn fùxí měi yī kē.
Faced with sudden difficulties, we should not panic, but deal with them calmly and calmly.
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考试来临，他如临大敌，认真复习每一科。
The exam is coming, he is like facing a great enemy, carefully reviewing each subject.