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.
工地设备。可调节的可伸缩钢支架的合用性。
Building site equipment - Fitness for use and implementation of adjustable telescopic steel props.
采用方钢支架式设计，给人以简单轻巧的感觉。
Square steel support design gives people simple and handy feeling.
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