雷打不动 unshakable
Explanation
形容态度坚定，不可动摇。也形容严格遵守规定，决不变更。
Describes a firm, unwavering attitude. It also describes the strict adherence to rules that will never be changed.
Origin Story
从前，在一个小山村里，住着一位老木匠。他每天清晨都会准时起床，然后去山林里砍伐木材。无论刮风下雨，还是酷暑严寒，他从不间断，乡亲们都夸他雷打不动。一天，一位年轻的木匠向老木匠请教技艺，他问老木匠为什么能这么坚持。老木匠笑了笑，说：“我的技艺是日积月累练成的，每天的练习就像雷打不动一样，只要坚持下去，就能有所成就。”年轻的木匠听了老木匠的话，深受启发，他从此也每天坚持练习，最终也成了一位技艺高超的木匠。
Once upon a time, in a small mountain village, there lived an old carpenter. Every morning, he would get up on time and go to the forest to cut wood. No matter the wind or rain, or the scorching heat or severe cold, he never stopped. The villagers praised him for his unwavering persistence. One day, a young carpenter asked the old carpenter for advice. He asked the old carpenter why he could be so persistent. The old carpenter smiled and said, "My skills were honed through years of practice. The daily practice was as unyielding as thunder. As long as you persist, you will achieve something." The young carpenter was deeply inspired by the old carpenter's words. From then on, he also practiced every day and eventually became a highly skilled carpenter.
Usage
作谓语、定语；形容态度坚定，不可动摇。
Predicate, attributive; describes a firm, unwavering attitude.
Examples
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他每天都坚持锻炼，风雨无阻，真是雷打不动。
tā měitiān dōu jiānchí duànliàn, fēngyǔ wú zǔ, zhēnshi léi dǎ bù dòng.
He insists on exercising every day, come what may. He's really steadfast.
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这项规定雷打不动，谁也不能违反。
zhè xiàng guīdìng léi dǎ bù dòng, shuí yě bù néng wéifǎn。
This rule is unchangeable; no one can violate it..