To sell horse meat as beefsteak is their usual practice.

挂羊头卖狗肉是他们的惯技。

《新英汉大辞典》

There was dried African bush meat seized by customs inspectors at Kennedy Airport. Horse viruses, clam viruses: all told, members of Dr. Lipkin’s team were working on 139 different virus projects.

比如从肯尼迪国际机场被海关扣下的来自非洲热带雨林地区的肉干上检测到马病毒，蚌肉病毒：总而言之，利普金博士的实验团队正在同时进行139种病毒研究项目。

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Did you ever eat horse meat?

你吃过马肉吗？

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The horse meat scandal began with tons of horse meat from Romanian abattoirs exported to France, where it was processed into ready-made meals.

NPR: Russia Seeks EU Guarantees Over Horse Meat Scandal

"The company has never ordered horse meat and we never knowingly sold on horse meat, " the representative said.

CNN: UK arrests, French investigation in horse meat scandal

He said Dutch authorities visited Nemijtek's facilities, from which Draap shipped between 40 and 100 metric tons of horse meat a month, to take samples of the horse meat.

WSJ: U.K. Arrests Men in Horse-Meat Probe