行规

pāi mài shāng mǎi mai zāng wù wéi fǎn le háng guī

拍卖商买卖赃物，违反了行规。

The auctioneers are violating a code of practice by dealing in stolen goods.

xiāo fèi zhě zhǐ yǒu xiān shú xī zhè xiē háng guī cái néng bì miǎn shàng dàng shòu piàn

消费者只有先熟悉这些“行规”，才能避免上当受骗。

Consumer is familiar with these first only "guild regulations", ability avoids to be deceived.