@mskathleenquinn @greg_travis The covid-sniffing dogs were always interesting. I mean you could use the dogs but you should also be able to come up with some sort of sensor that replicates it.
@mskathleenquinn @greg_travis 嗅探新冠病毒的狗总是很有趣。我的意思是你可以使用狗，但你也应该能够想出某种传感器来复制它。