名词
中文翻译：格里高利历
同义词：
['Gregorian', 'Julian', 'Julian calendar']
例句：
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1.The ancient Romans used a calendar based on the solar year.
古罗马人使用一种基于太阳年的日历。
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2.The modern Gregorian calendar is used in many countries around the world.
现代格里高利历在全球许多国家被使用。
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3. The Gregorian calendar was introduced in 1582 as an alternative to the Julian calendar.
格里高利历于1582年引入，作为朱利安历的替代。