名词
中文翻译：下界
同义词：
['lower limit', 'lower boundary']
例句：
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1. The temperature at the bottom of the ocean is the lower limit of life.
海洋底部的温度是生命存在的下限。
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2. The researchers set a lower limit for the amount of radiation that can be absorbed by the human body.
研究人员设定了人体可以吸收辐射的下限。
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3. The company has set a lower limit on its profit margins.
该公司已设定其利润边际的下限。