规定不是一成不变的，可以改。規定不是一成不變的，可以改。規定不是一成不變的，可以改。

Rules aren't set in stone; they can be changed.

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Simplified: 规定不是一成不变的，可以改。
Traditional (Taiwan): 規定不是一成不變的，可以改。
Pinyin: Guīdìng bú shì yìchéngbúbiàn de, kěyǐ gǎi.
Bopomofo: ㄍㄨㄟㄉㄧㄥˋ ㄅㄨˊ ㄕˋ ㄧˋ ㄔㄥˊ ㄅㄨˊ ㄅㄧㄢˋ ˙ㄉㄜ，ㄎㄜˇ ㄧˇ ㄍㄞˇ。

Written with HSK 7-9 vocabulary, at CEFR level C1.

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一成不变

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