名词
中文翻译：循环
同义词：
['circular', 'recurring', 'cycle']
例句：
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1. The cycle of life is a beautiful metaphor for the passage of time.
生命的循环是时间流逝的美丽隐喻。
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2. The teacher explained the concept of the circle in detail.
老师详细解释了圆的概念。
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3. The cycle of seasons has been observed by many astronomers.
许多天文学家观察到了季节的循环。