名词
中文翻译：日全食
同义词：
['solar eclipse', 'solar occultation']
例句：
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1.The ultradian is a rare phenomenon that occurs only once every few thousand years.
日全食是一种罕见的现象，每几千年才会出现一次。
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2. During the ultradian, the sun's disk completely blocks the view of the moon.
日全食时，太阳的圆盘完全遮住了月亮的视图。
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3.Astronomers study the ultradian to better understand the behavior of our planet's atmosphere.
天文学家研究日全食以更好地了解我们星球大气的行为。