As an expert in linguistics and idiomatic expressions, I can explain that the phrase "carved in stone" is an idiom that suggests something is permanent, unchangeable, or fixed. It is often used to indicate that a decision or rule is not open to discussion or alteration. The expression comes from the idea that stone is a hard, durable material that is difficult to alter once something has been carved into it.

Here's the breakdown with the key terms in red:

- Permanent: lasting or intended to last or remain unchanged indefinitely.
- Unchangeable: not able to be altered or modified.
- Fixed: settled or established.

Now, let's translate that into Chinese:

“刻在石头上”这个短语是一个成语，用来表示某些事情是永久的、不可改变的或固定的。它通常用来指一个决定或规则不容讨论或更改。这个表达来源于石头是一种坚硬、耐用的材料，一旦有东西被雕刻进去，就很难改变。

这里是中文翻译，重点词汇已用红色标出：

- 永久的：持续或意图持续或保持不变，直到无限期。
- 不可改变的：不能被改变或修改的。
- 固定的：确定或建立的。

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Adj. 1. carved in stone - no longer changeable; "the agreement is not yet set in stone" set in stone. unchangeable - not changeable or subject to change; "a fixed and unchangeable part of the germ plasm"-Ashley Montagu; "the unchangeable seasons"; "one of the unchangeable facts of life"read more >>