以下为句子列表：
英文: Although it is possible to have a negative leap second -- that is, a second deducted from Coordinated Universal Time -- so far all have been add-ons, reflecting the Earth's general slowing trend due to tidal braking.
中文: 尽管也有实施负闰秒制（从协调世界时中扣除一秒）的可能，但迄今为止，只有加，没有减，这说明由于受潮汐减速的影响，地球的自转速度大体上呈减慢趋势。
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英文: This function retrieves the current system date and time. The system time is expressed in Coordinated Universal Time (UTC).
中文: 请问本地日期时间和系统日期时间有什么区别？谢谢！
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