The study looked at viral transmissions involving all the vertebrate groups: mammals, birds, reptiles, amphibians and fish.

该研究研究了涉及所有脊椎动物群体的病毒传播：哺乳动物、禽类、爬行动物、两栖动物和鱼类。

In 2015, our team decided to tackle the viral transmission problem first.

2015 年， 我们的团队决定首先解决病毒传播问题。

And worried about carbon emissions -- not viral transmissions -- we were already wearing masks.

担心碳排放——而不是病毒传播——我们已经戴上了口罩。