For instance, a 2018 study looked at the role of chemosignals in making us feel empathy.

例如，2018年的一项研究研究了化学信号在让我们产生同理心方面的作用。

So some scientists wondered how much these chemosignals might play a role in emotional contagion among humans.

因此，一些科学家想知道，这些化学信号在人类情绪传染中可能发挥多大作用。

Scientists still don't know exactly what chemicals act as chemosignals, so there's still plenty of research to be done.

科学家们仍然不知道到底是什么化学物质起到了化学信号的作用，所以仍有大量的研究要做。

And studies had also shown that certain animals transmit emotions like fear through invisible cues in their scent, known as chemosignals.

研究还表明，某些动物通过气味中的看不见的线索传递情绪，比如恐惧，这被称为化学信号。