Pig viruses are similar to human viruses and that allows human to human transmission to happen quicker.

猪病毒类似于人类病毒，它使人与人之间的传播变得更快。

And seventy seven human viruses invade a living cell and turn it into a factory.

而77种人类病毒侵入一个活细胞并把它变成一个工厂。