名词
中文翻译：有用的寿命
同义词：
['effective lifespan', 'useful life-expectancy']
例句：
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1. Thenew technology has a useful lifespan of five years.
这项新技术的有效寿命为五年。
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2.The company's useful lifespan is expected to last at least ten years.
该公司的有效寿命预计至少能持续十年。
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3.The useful lifespan of the product is significantly longer than its competitors.
该产品的有效寿命显著长于竞争对手。