常备不懈 always be prepared
Explanation
常备不懈，意思是经常做好准备，一点也不松懈。形容时刻准备着，毫不懈怠。
Constantly prepared and never negligent. It describes the state of being constantly ready and the complete absence of negligence.
Origin Story
话说古代有一位将军，名叫卫青。他深知兵家之言“居安思危，思则有备，有备无患”，因此他常年率领士兵们进行军事训练，即使在和平时期也毫不懈怠。他总是告诫士兵们要时刻保持警惕，随时准备应对任何突发事件。有一天，边境传来警报，敌军入侵。卫青的军队早已准备就绪，他们迅速集结，以迅雷不及掩耳之势将敌军击溃。卫青常备不懈的策略，不仅保卫了国家安全，也让他成为了千古名将。这便是常备不懈的重要性，居安思危，未雨绸缪，才能在关键时刻立于不败之地。
It is said that there was a general in ancient times named Wei Qing. He deeply understood the words of the military strategist "Be prepared for danger in times of peace, those who think, are prepared, and those who are prepared have nothing to fear." Therefore, he led his soldiers to conduct military training year-round, even during times of peace, without any relaxation. He always warned his soldiers to always remain vigilant and be ready to respond to any emergencies at any time. One day, an alarm came from the border; the enemy was invading. Wei Qing's army was already fully prepared, they gathered swiftly and routed the enemy troops with lightning speed. Wei Qing's strategy of constant readiness not only protected national security, but also made him a famous general throughout history. This is the importance of constant preparedness, to think about danger in times of peace, to prepare in advance, only then can one remain undefeated in a crucial moment.
Usage
常备不懈通常作谓语、状语使用，形容时刻准备着，毫不松懈。
"Always prepared" is typically used as a predicate or adverbial, describing a state of constant readiness without negligence.
Examples
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军队常备不懈，随时准备应对各种突发情况。
jūnduì chángbèi bùxiè, suíshí zhǔnbèi yìngduì gèzhǒng tūfā qíngkuàng.
The army is always ready to respond to any emergencies.
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国家要常备不懈，才能维护国家安全。
guójiā yào chángbèi bùxiè, cáinéng wéihù guójiā ānquán。
The country must always be vigilant to maintain national security.