HSK 7-9
定律
dìnglǜ名
scientific law (e.g. law of conservation of energy); (in human affairs) a generalization based on observation (e.g. "power corrupts")
学生用实验验证物理定律。
Xué shēng yòng shí yàn yàn zhèng wù lǐ dìng lǜ.
The students verified a law of physics through an experiment.
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Appears across levels (7-9) in the HSK 3.0 word list.