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单词	lifespan
释义	lifespan /ˈlʌɪfspan / noun The length of time for which a person or animal lives or a thing functions: the human lifespan... As humans lengthened lifespans with better nutrition and hunting skills, childhood also lengthened. They are slow-breeding and long-lived animals, achieving lifespans of 70 years or so. I suggested that extending human lifespans might lead to extended creativity.
随便看	ups-a-daisy ups and downs upscale upsell upset upset price upsetter upset the apple cart upsettingly upshift upshot upside upside down upside-down cake upside-down catfish upsides upsilon upsilon particle upsize upskill upslope upsloping upstage upstair upstairs

英语词典包含243303条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。