In reindeer, even if they're missing a circadian clock, melatonin levels still spike when it's dark and drop when it's light, making the equinoxes an ideal time to synchronize their annual clocks.

而驯鹿呢，虽然它们没有昼夜节律钟，其褪黑激素水平仍然会在黑暗的时候上升，光亮的时候下降，从而使它们的昼夜分点达到理想状态，进而与年生物钟同步。

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A look at how the record-setting mercury clock would work reveals the basics of all contemporary neutral-atom lattice clocks.

通过观察这个汞原子钟是如何工作的将奠定目前所有中性原子晶格钟的基础。

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After a number of long distance flights the two clocks were compared and the one that had been on the plane was running behind the clock that had stayed on the ground.

经过多次远距离的飞行之后再比较两个钟表，结果发现喷气式飞机上的钟表比地面上的钟表跑得慢。

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Breguet installed four Classique clocks and one Reine de Naples clock.

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Gene Block, a professor of psychiatry and biobehavioral sciences at University of California, Los Angeles, and colleagues found that by middle age, the signal the master body clock in the brain sends out to other internal clocks to help resynchronize the different processes gets weaker.

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In an email to media outlets, he said game clocks are designed to recalibrate themselves and that the clock may have slowed simply because it had moved too quickly earlier.

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