Remote temperature sensors, for example, have become all the rage to try and spot virus carriers.

例如，远程温度传感器已经成为发现病毒携带者的热门工具。

Current estimates are still imprecise, but people think that about 20 percent of virus carriers are asymptomatic.

目前的估计仍然不准确，但人们认为大约 20% 的病毒携带者是无症状的。