Xushi plastic co., Ltd is a company specialized in plastic valves, tube and metal valve. Our company gathers development, producing, sales and service.

玉环许氏塑业有限公司许氏塑业是生产塑胶阀门、管件、金属阀门的专业公司，公司集开发、生产、销售、服务于一体。

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Man-made damage, due to ill-metal valve design, manufacturing is not fine, improper selection, installation is not correct, use the good and poor maintenance caused by such factors.

人为损坏，是由于金属阀门设计不周、制造不精、选材不当、安装不正、使用不好和维修不力等因素引起的。

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The procedure involves an artificial aortic valve, made from pieces of a cow's valve sewn to a metal frame.

该过程涉及到使用一只人工制作的主动脉瓣，它是由一个缝在金属框架里的牛的脉瓣制成的。

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Lastly, up here, is a picture of a much smaller device, this is actually an artificial heart valve that is made of plastics and metal and can replace the valve inside your heart.

最后,在上面这里,这张图片是一个相对较小的装置,这实际上是一个人工心脏瓣膜,由塑料和金属制成,可以取代人的心脏瓣膜

耶鲁公开课 - 生物医学工程探索课程节选