以下为句子列表：
英文: Greenwich Mean Time (GMT) is mean solar time at the Royal Greenwich Observatory in Greenwich, London, England, which by convention is at 0 degrees geographic longitude.
中文: 格林尼治国际标准以英国伦敦格林威治皇家天文台为准，也就是零经度为准。
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英文: US scientists want to change the current system, which keeps clocks in synch with solar time by adding a leap second every 18 months or so.
中文: 美国科学家希望改变现行系统，亦即透过每隔约18个月添增1闰秒，让时钟与太阳时保持一致。
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