一定不易 | fixed and unchangeable

yī一dìng定bù不yì易

Unchangeable; unalterable; indisputable and firmly established truth or principle.

经过科学家们多年的研究与验证，这条物理定律被认为是颠扑不破，一定不易的。

After years of research and validation by scientists, this law of physics is considered irrefutable and unalterable.

Era:

Ancient

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