名词
中文翻译：永久性日历
同义词：
['perpetual calendar', 'perennial calendar']
例句：
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1. The permanent calendar is a device that records the date of each year indefinitely.
永久性日历是一种记录每年日期的设备，可以无限期地记录。
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2. She bought a perpetual calendar as a gift for her husband's birthday.
她买了一个永久性日历作为她丈夫生日的礼物。
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3. The perpetual calendar was a popular choice for those who wanted to keep track of their schedules without the hassleof constantly checking the clock.
永久性日历是那些想要不频繁查看时钟就能跟踪自己日程的人的热门选择。