HSK 7-9
不准
bù zhǔnnot to allow; to forbid; to prohibit
仓库内不准使用明火。
Cāng kù nèi bù zhǔn shǐ yòng míng huǒ.
Open flames are prohibited inside the warehouse.
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Appears across levels (7-9) in the HSK 3.0 word list.