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。
Times are recorded as hours and minutes in the 24 hour clock, separated by one blank and with two digits for each number.
这些数据间都由空格隔开。时间均由24小时制的小时和分钟表示，之间由一个空格隔开，每个数字都有两位数(译注：不足两位的前面补零)。
Times are recorded as hours and minutes in the 24 hour clock, separated by one blank and with two digits for each number.
这些数据间都由空格隔开。时间均由24小时制的小时和分钟表示，之间由一个空格隔开，每个数字都有两位数(译注：不足两位的前面补零)。
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