以下为句子列表：
英文: A leap second is added to keep uniform timekeeping within 0.9 second of the Earth's rotational time, which can speed up or slow down because of many factors, including ocean tides.
中文: 增加这一闰秒是为了保证协调世界时（原子时）和地球自转时间（天文时）之间的差距控制在0.9秒以内，地球自转速度的加快或减慢受到很多因素的影响，潮汐就是其中之一。
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英文: Additionally, the growth of urban mercantile populations in Europe during the second half of the 13th century created demand for improved timekeeping devices.
中文: 此外，由于13世纪的后半，欧洲都市的商业人口持续增加，改进计时技术的需求也就愈来愈急切。
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英文: Another person pionering the studies in Germany reported that when people were put together in groups isolated from external time cues of light ,temperature and humidity ,their own complex internal timekeeping rhythms became desynchronized;then they resyn
中文: 另一位在德国研究此问题的领头人公布说，将人们聚拢起来，同时使他们隔绝于光线、温度、湿度等反映外部时间的信息，人们自身复杂的生物钟节律先是会各自发生偏差（即:对时间的感知出现不同的认识），然后又会重新恢复到一致的状态。
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英文: It created a standard for Internet timekeeping that eliminated time zones, dividing the day into 1,000 increments that are the same anywhere on the globe, with the meridian at Biel, Switzerland, the location of Swatch's headquarters.
中文: 他们为网际网路设计了新的计时标准，不采取时区制，而是将每一天分隔成1000个单位，世界各地都标示同样的时间，以通过帅奇錶总部所在地（瑞士俾尔市）的经线为本初子午线。
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英文: The steelyard clepsydra, a special type of clepsydra, had been the chief timekeeping instrument during the Sui-Tang period and the earlier stage of the Northern Song dynasty.
中文: 摘要秤漏是一种特殊类型的漏刻，在隋唐及北宋前期曾是司天机构的主要计时仪器。
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