例句與造句

1. Starr " helped invent the world's first durable artificial mitral valve ".
2. Braunwald designed and fabricated experimental artificial mitral valve prostheses, implanting them in dogs at the National Heart Institute's surgical clinic in 1959 . On 11 March 1960, the first successful human implant followed, in a 44-year-old woman with mitral regurgitation.
3. It's difficult to find artificial mitral valve in a sentence. 用artificial mitral valve造句挺難的