浸根法可适用于弱毒株的大量接种。
The root soak was a method to mass inoculation of mild strains.
考察了弱毒株本身对烟草植株的影响。
We examined the effects of mild strains of TMV on the tobacco plants.
本试验用犬瘟热弱毒苗免疫的犬，提取了特异性犬脾转移因子（TF） 。
The specific transfer factor(TF) is extracted from spleen of canine that have been immunized with attenuated canine distemper vaccine(CDV).
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