【Key words】 Turnip mosaic virus； histopathology； photosynthesis； chloroplast； photosystem II； coat protein； Cucumber mosaic virus； mild virus； induced protection；
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很多计算机病毒、蠕虫和特洛伊木马的设计都利用了弱口令。
Many computer viruses, worms, and Trojan horses are designed to exploit weak passwords.
应用组织学方法比较观察了猪繁殖与呼吸综合征病毒（PRRSV）弱毒细胞疫苗与灭活疫苗生殖道黏膜免疫的效果。
The effect of mucosal immune of porcine reproductive and respiratory syndrome virus (PRRSV) attenuated and disactived vaccine was investigated by histological method.
新城疫病毒B95 (NDV B95)是从国外引进的一株热稳定性的天然弱毒株。
Newcastle disease virus (NDV) avirulent strain B95 was newly introduced from abroad.
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