He's an expert on bovine valve replacement surgery. 他是牛瓣膜移植手术的专家
How long would it take to get a cow valve? 一个牛瓣膜送来要多长时间
The bovine valve has only been an option the last few years. 牛心二尖瓣是近些年才用于临床治疗
a bovine mitral valve instead of the pig. 牛心二尖瓣取代猪的做移植
necessary to maintain a mechanical heart valve. 而那是换人工瓣膜所必需的
We're suggesting a porcine valve instead. 我们建议改用猪瓣膜
Your daughter needs a valve replacement. 你女儿需要换心脏瓣膜