美国的食品和药品管理局已经发表了异种移植的指导原则草案。
America's Food and Drug Administration has already published draft guidelines for xenotransplantation.
研究表明，丁二烯聚合机理原则上同样适用于异戊二烯的负离子聚合。
The experimental results showed that the mechanism of anionic polymerization of butadiene was also fit for the anionic polymerization of isoprene.
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