Earlier this year the discovery of a single cow with bovine spongiform encephalopathy, better known as mad cow disease, crippled the Canadian cattle market.
Earlier this year the discovery of a single cow with bovine spongiform encephalopathy, better known as mad cow disease, crippled the Canadian cattle market.
今年年初，光是一宗牛海绵状脑病（即狂牛症）的个案，便重创了加拿大的牛只市场。