Viruses can exist either extracellularly or intracellularly.

病毒可胞外，也可胞内。

They can exist either extracellularly where the virus is inactive and isn't capable of reproducing or intracellularly where the capsid is removed and the virus becomes active.

它们可胞外，处不活跃状态，无法复制，或者胞内，脱掉衣壳，变得活跃。