这个软件已经过是否有病毒的测试。
我们说过没有病毒你也可以做到。
比利:我觉得我的电脑肯定有病毒。
Hepatitis is a virus that specifically affects the liver, so viruses are often specific to certain kinds of cells.
肝炎病毒就可以特异性的感染肝细胞,因病毒通常都有细胞特异性
So, it's awkward to have to wait for a cow to get infected before you can vaccinate a population.
在给人们预防接种之前,你只有干等着,直到有一头奶牛感染了病毒才行
You make a recombinant virus that has all the normal components of the virus but also has a gene that you want.
你就造出了一个重组病毒,它有普通病毒的各种组分,又带有你需要的基因
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