名词
中文翻译：循环
同义词：
['circular', 'cycle', 'recurrent', 'circuit', 'loop']
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 cycle of seasons has been observed by many ancient civilizations.
四季的循环被许多古代文明所观察。
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3. The cycle of growth and decay is a fundamental part of nature's workings.
生长和衰败的循环是自然运作的基本部分。