Twenty-four-hour clock 二十四小时制
clock-hour figure 钟时序数
clock hour 时钟小时
every hour around the clock 昼夜每小时
the hour-hand of the clock 那时钟的时针
But it doesn't make sense to live by a 24-hour clock in the Arctic, where it's dark or light for months at time.
但是在北极，每次白天和黑夜都要持续好几个月，24小时的生物钟似乎没什么意义。
Scientists have identified the mechanism that controls the internal 24-hour clock of all forms of life — from us to algae.
科学家已经证实生物钟机制存在于整个生物界——从生物链顶端的人类到低等生物海藻。
The researchers split the patients into four groups based on what time segment of the 24-hour clock the heart attack occurred.
研究人员根据在24小时中心脏病发病的时段，将病人分成四组。
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