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.
沙发的底座有不锈钢支架支撑，上面的软垫也很舒适。
Sofa base stainless steel stent support, the above is also very comfortable cushion.
沙发的底座有不锈钢支架支撑，上面的软垫也很舒适。
Sofa base stainless steel stent support, the above is also very comfortable cushion.
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