Tā de chúyì tài chà, zài zhuānyè chúshī yǎnzhōng gēnběn bùrùliú.
His cooking skills are so poor that they don't even register in the eyes of professional chefs.
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history
不入流 originally comes from imperial China's nine-grade civil service system (九品制). Officials below the ninth grade were 不入流 - too low to even be ranked. Today it means anything beneath a recognized standard.
