Circadian rhythms can be affected to some degree by almost any kind of external time cue, such as the beeping of your alarm clock, the clatter of a garbage truck, or the timing of your meals.

生物钟节律在一定程度上可以受任何外界时间线索影响，如闹钟的声音清洁车的声音及进餐的定时等。

youdao

That may be a hint that yawn evolved as a social cue—"time for us all to go to bed".

也许这是打哈欠进化为社交线索的一种暗示——“到我们大家睡觉的时间了”。

youdao

youdao

You can configure four different triggers at one time, controlling cue points, looping and so on.

ENGADGET

The goal will be to hit the cue ball one time and have all the balls go in the pocket.

NEWYORKER: Shifting Targets

But after 300 sessions spread over the course of a year, two of Dr Birbaumer's patients were able to put out signals on cue three-quarters of the time.

ECONOMIST: Neurology