一般心脏瓣膜置换手术包括用猪或牛组织瓣膜置换损毁或有漏洞的瓣膜。
Heart valve replacement surgery typically involves replacing the faulty or leaky valve with a pig or cow tissue valve.
猪是一种多产胎动物，一头好的母猪能产10头甚至更多的小猪，一般来说一头母猪一年能产两窝小猪。
The pig is a litter-bearing animal and a typical female will give birth to 10 or more piglets. It is common for sows to give birth to two litters of pigs each year.
国内外有关文献对猪头部的植物性神经仅作了一般的描述，对猪的鼓室神经丛则未见有详细的描述。
Only general description of autonomic nerves in swine head was found in literatures at home and from abroad, and a description of swine tympanic plexus in detail had not been found.
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