答：科学家们已经识别出五种截然不同的肝炎病毒并以甲、乙、丙、丁、戊型作为辨识。虽然它们都会引起肝病，但在重要方面又有所不同。
A: Scientists have identified five unique hepatitis viruses, identified by the letters a, b, c, d, and E. While all cause liver disease, they vary in important ways.
科学家们已经识别出五种截然不同的肝炎病毒并以甲、乙、丙、丁、戊型作为辨识。虽然它们都会引起肝病，但在重要方面又有所不同。
Scientists have identified five unique hepatitis viruses, identified by the letters A, B, C, D, and E. While all cause liver disease, they vary in important ways.
本文综述了近五年双环戊二烯聚合材料进展。
Recent five-year development of polymer materials made from dicyclopentadiene is reviewed in the article.
羰化反应条件下考察了异戊二烯、1-辛烯、环戊二烯、混合碳五馏份及脱去环戊二烯的碳五馏份的羰基合成反应。
The hydroformylation of isoprene, 1 octene, cyclopentadiene, and C 5 distillate where cyclopentadiene has been removed is studied under the hydroformylation conditions(6.
羰化反应条件下考察了异戊二烯、1-辛烯、环戊二烯、混合碳五馏份及脱去环戊二烯的碳五馏份的羰基合成反应。
The hydroformylation of isoprene, 1 octene, cyclopentadiene, and C 5 distillate where cyclopentadiene has been removed is studied under the hydroformylation conditions(6.
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