备而不用 Prepared but not used
Explanation
准备好，以备急用，眼下暂存不用。比喻事先做好准备，但目前还用不上。
Prepared for use in case of emergency, but not currently used. A metaphor for preparing in advance, but not yet needed.
Origin Story
话说很久以前，在一个偏远的村庄里，住着一位名叫老李的农夫。他勤劳善良，总是为未来做好准备。每年秋季收获之后，他都会把多余的粮食储藏起来，以备不时之需。村里其他人常常嘲笑他，说他杞人忧天，可老李却始终坚持自己的做法。 一年，一场突如其来的旱灾席卷了整个村庄，庄稼颗粒无收，人们都面临着饥饿的威胁。这时，老李的粮食储备就派上了大用场。他毫不犹豫地拿出自己的粮食，分给了村里的每一个人，帮助他们度过难关。村里人这才明白，老李的“备而不用”并非杞人忧天，而是深谋远虑的体现。他们不仅感谢老李的慷慨，更敬佩他未雨绸缪的智慧。从此以后，村里人也都效仿老李，开始储备粮食和其他生活必需品，以应对可能发生的各种突发事件。
Once upon a time, in a remote village, there lived a farmer named Lao Li. He was diligent and kind, always preparing for the future. Every autumn after the harvest, he would store the surplus food for a rainy day. Others in the village often laughed at him, saying he was worrying unnecessarily, but Lao Li always stuck to his ways.
Usage
形容事先做好充分准备，但目前不需要使用。常用于军事、生产等领域。
Describes the previous comprehensive preparation, but it is not currently needed. It is often used in the fields of military and production.
Examples
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国家虽然储备了大量粮食，但目前还处于和平时期，这些粮食备而不用。
guojia suiran chubeile daliang liangshi, dan muqian hai chu yu heping shiqi, zhe xie liangshi bei er buyong
Although the country has stockpiled a large amount of grain, it is still in a peacetime period, and this grain is not being used.
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为了应对可能的自然灾害，我们需要备而不用，做好充分的准备。
weile yingdui keneng de ziran zaihai, women xuyao bei er buyong, zuohao chongfen de zhunbei
In order to cope with possible natural disasters, we need to prepare without using it and make sufficient preparations.