这种瓣膜是用不锈钢支架和牛心包制成的。

The valve is made of a stainless-steel stent and cow pericardium.

youdao

这种瓣膜是用不锈钢支架和牛心包制成的。

The valve is made of a stainless-steel stent and cow pericardium.

youdao