zài / quē fá / zhuān yè / zhī shi / de / qíng kuàng xià / xiāo fèi zhě / duì / shāng pǐn / zhēn wěi mò biàn

在缺乏专业知识的情况下，消费者对商品真伪莫辨。

Without professional knowledge, consumers cannot distinguish authentic products from counterfeit ones.