返祖的 meaning in English

atavic
atavistic

North east of buendia , only the ancient spanish pine forests seem able to sustain life , some atavistic survival instinct seeing them triumph over droughts which long ago killed off the weaker competition
在布温迪亚东北，只有古老的西班牙松林似乎还能勉强支撑着活下来，一些返祖的生存本能使它们显示出了战胜干旱的迹象，而干旱在很久以前就夺去了较弱的竞争者的生命。
Prevention and cure of the derzsy ' s disease depended on vaccine and antiserum , antibodies of eggs . the vaccines includes goose embryo and duck embryo vaccines which were used 1n breed goose and goslings , and those vaccines have great effect in breeding goose , but the entire virion live vaccines and attenuated vaccines exist many deficiencies . such as preclinical infection , dissemination of virus , recovery of viru5 , etc . those proplems can be sol / ed by producing genetic engineering " asclne
目前使用的疫苗分为种鹅用和雏鹅用的鹅胚和鸭胚化疫苗，这些疫苗在实际生产中发挥巨大作用，因其为全毒苗或弱毒苗，存在着潜伏感染，排毒散毒，毒力返祖的缺陷，基因工程疫苗的研制可解决上述问题。