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.
根据河北省自然灾害的区域分异规律和社会经济状况，提出了河北省自然灾害区划的原则、方法指标体系，进行了自然灾害区划，并对不同灾害区提出了防灾减灾对。
Based on the regional distributive laws of natural hazards and economics in Hebei province, the principles, methods and index systems of Hebei natural hazard regionalization have been advanced.
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