To advertise one thing but sell another; to practice deception or hypocrisy; to pass off inferior goods under a good name.
这家公司对外宣称产品质量上乘，但实际上却是羊头狗肉，提供的服务和产品都大打折扣。
This company outwardly claims its products are of superior quality, but in reality, it's 'hanging out a sheep's head and selling dog meat,' with both the services and products offered being greatly compromised.
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