Traditional: 規律
规律 (guī lü) means “rule (e.g. of science); law of behavior; regular pattern; rhythm; discipline”. It is an HSK 5 Chinese word (traditional 規律) in the HSK 3.0 vocabulary.
自然界有其规律。
Zìránjiè yǒu qī guīlǜ.
Nature has its own laws.
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