名词
中文翻译：生命的长度同义词
同义词：
['lifespan', 'duration']
例句：
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1. The elderly often face a shorter life expectancy.
老年人往往面临较短的预期寿命。
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2. The study found that the longer the lifespan of the species, the more likely it is to have developedthese traits.
研究发现，物种的寿命越长，就越有可能发展出这些特征。
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3.The researcher proposed that the longer lifespan could be due to genetic factors.
研究者提出，更长的寿命可能是由于遗传因素。