If you look at the y-axis of this graph, you'll see that, in the mechanically ventilated air, you have a higher probability of encountering a potential pathogen, or germ, than if you're outdoors.
如果我们看一下竖轴 你会发现，在机械通风系统下 将会有更高的可能性 遇到潜在的病原体 或是病菌 相比于在室外的条件下