You can see this even in things like how closely synchronized the clocks are on a city street.

您甚至可以在城市街道上的时钟同步程度等方面看到这一点。

We also know that about 50% of people who observe a yawn will yawn in response, so it's thought to be a social cue to synchronize biological clocks.

我们也知道，大约50%看打哈欠的人会做出打哈欠的反应，所以这被认为表现同步生物钟的社会性线索。